When you leave the save room, there are four zombies in the prototype, whilst the final has five of them. The door was also flipped.

In the prototype, no music plays here, but in the final, "The Underground Laboratory" starts playing.

The final version gave this part of the corridor a green tint.

If you go into the train that's in this room, the cutscene is slightly different in the prototype, as no borders appear, and Leon does not move his arm like he does in the final.

This room was made slightly darker in the final, despite the light above the entrance being made longer.

The prototype had some red lighting on the floor here, but the final removed it. The biggest change here is that the lights above the entrances were changed. They're both white in the prototype, but where changed to blue and red for the final.

These two catwalks have some differences in the placement of the doors, but the main difference is the final added some blue and red light strips to the floors. The lights above the doors also had the colors changed, and parts of the background were made darker in the final.

This background in the east wing corridor had the door changed for the final. What was a red light on the wall becomes a longer, blue light for the final, and the room was brightened up slightly.

All the lights in this room were changed for the final. The text on the wall was also changed -possibly because a word was spelt wrong! In the prototype, it reads "LABORATRY EAST AREA", whilst in the final the laboratory text was removed, and the east area text was made larger.

The prototype is missing the snow the final has for these two backgrounds, in addition to the usual light changes.

The lack of snow is also seen on the prototype's door opening animation.

In the prototype, it's not obvious which console you're supposed to use here, the final makes it clearer by adding a blue light to it. The final also has a first aid spray on the barrel, which the prototype lacks.

When the robot arm does its thing, you don't get cutscene borders in the prototype, but do in the final.

When you go back to insert the fuse, Leon will be onscreen as it screws into position. He doesn't seem to be there in the final.

When the power is restored, there are some additional shadows to this room in the final, which weren't there in the prototype.

The prototype also has a glitch were Leon can overlap part of the background here, which the final fixed.

The west area corridor has similar changes to the east area corridor -lights on the walls were altered, and this door was changed.

Again, the text here was changed, getting rid of the "LABORATRY" typo and making the west area text larger. The text was orange in the prototype, but changed to red for the final.

In the prototype, Leon looks at the shutter door, giving away the fact that there are enemies behind it. In the final, he will not look at it.

When the shutter opens, there are two plant 43s behind it in the prototype. In the final, there are two evolved plant 43s. The evolved version of this enemy does not appear in the prototype at all.

The prototype lacks the cutscene borders the final has here, and whilst Leon is on the screen in the prototype, he's not in the final.

This background was made brighter in the final.

If you leave this room and come back in, another two evolved plant 43s will spawn in the final. This doesn't happen in the prototype.

In the prototype, there are no zombies in this room, whilst in the final, there are three zombies.

In the prototype, the computer monitor does not flash like it does in the final, and the green light is missing. There is no file to collect next to it, instead, it's where the Umbrella card is. The computer can't be used in the prototype at all, whilst in the final, it can be used to turn on the anti B.O.W. sprinklers.

There is also some handgun ammo on the bed, this was removed from the final. The prototype is missing the blue herbs next to the bed which the final has. The prototype has some magnum ammo on the table, this was removed from the final, and replaced with the Umbrella card.

The cabinet contains shotgun shells in the prototype, and the flamethrower in the final. Finally, Leon overlaps the sofa in the prototype, this was fixed for the final.

The prototype has a green herb next to the ladder, which the final removed.

When enter the vent, the prototype has a grid opening animation on it, which seems to be an error since the background had no grid over the vent. The final got rid of the grid.

There is a blue herb on the floor here in the prototype, which the final version removed.

If you wait on this background, the prototype will freeze after a few seconds.

In the prototype, the moment you get onto this screen, it freezes. You can at least see that originally, there were two plant 43s here, whilst in the final, there are two evolved lickers.

Unlike in the prototype's A scenario, there does not seem to be a way to stop this freeze glitch from happening in the B scenario.

Back over at the west area, the prototype is lacking the evolved plant 43 the final has here. It also has two blue herbs, the final changes them to green herbs.

The giant plant on this background lacks any moving vines in the prototype, whilst the final has several.

At the bottom of the ladder, there are again no moving vines on the plant in the prototype, whilst the final has several.

The prototype has a blue and red herb near the door, these were removed from the final. The prototype also has two seemingly misplaced herbs to the left, which are unobtainable -they're overlapping the bottom of the plant.

In the prototype, the door here does not match with the door used on the previous background, the final fixed this. Strangely the lighting effect on the lower right light was removed from the final version.

In the prototype, a plant 43 drops down here, whilst in the final, it's an evolved licker.

This background got zoomed in for the final. There's also a green herb here, which the prototype lacks.

This background got zoomed out for the final. It also has two extra green herbs, whilst the prototype has none. The biggest difference is the lack of enemies -the final has two evolved lickers prowling around here, whilst the prototype has nothing.

There is also some graphical glitch with Leon's ankles if you stand in a certain spot in this background, the final fixed this.

The prototype has a small switch next to the shutter door, the final replaces it with a computer terminal. There is a yellow and black pattern around the door in the final, which the prototype doesn't have. Leon's feet also glitch in a certain spot.

This background is in the final, but it is only briefly used in the A scenario for when you open the shutter door later on.

These backgrounds had a lot of small changes made to them -there are a lot of pixels around the monitors that were altered later, among other things. The prototype also has a red light on here, which the final lacks. You can interact with it, and I believe it's where you turns the anti-B.O.W. gas on. In the final, you can do this much earlier, in the room with the vines blocking the vent.

The ceiling for this background was amended for the final.

The weapons locker has a white light in the prototype, this was changed to blue for the final. The door frame on the left was also changed.

The prototype also has some shotgun ammo next to the table, which the final removed.

The weapons locker contains two magnum clips in the prototype. In the final, it contains the magnum parts.

The slide door glitches in the prototype -it overlaps the background when it moves up. This was fixed for the final. There are some other differences, like the rails being changed, and the lighting effect on one of the lockers was moved.

There is also a zombie in the prototype, whilst in the final, there isn't -there are zombies in this room, but they're moved further back.

The slide door here is glitched in the prototype too, overlapping the background. Zombies can also overlap things they shouldn't, which was fixed up for the final.

This background has a glitch in the prototype where enemies and items overlap parts of it. Fixed for the final.

These backgrounds have a glitch in the prototype where the slide door and enemies can overlap parts of them. These issues were fixed for the final version.

The final version has a much louder humming noise heard throughout this room than what can be heard in the prototype.

The door at the bottom screen always seems to close in the prototype, but won't in the final.

This background was completely changed for the final version.

The angle for this background was changed. Note the overlapping enemy in the prototype.

There is a small glitch here in the prototype -the panel that moves up overlaps the computer. The final fixed this.

When you leave the lab, for some reason Leon spawns some distance away from the door in the prototype. This was corrected for the final.

The giant moth in this room was moved slightly to the left in the final version.

The monitor doesn't flash in the prototype, but does in the final.

When you use the computer, the English text displayed on it was mostly rewritten for the final version.

The sound effects the computer makes when you enter the user name were made slightly louder for the final. The sound effects for using the different keys were also changed for the final.

If you go back over to the east area and open the shutter door there, the door at the back was amended slightly for the final. The yellow light on the computer is misaligned in the prototype, this was fixed for the final.

Strangely the backgrounds match here other than the final being brighter.

I could not get this door to open by usual means in the prototype -it seems to me that if you do the guest fingerprint scan in the A scenario, it changes the light to yellow. But if you try to do the fingerprint scan in the B scenario, it won't let you open it.

In the final, if you did the fingerprint scan with Claire in her A scenario, and then do the same with Leon in the B scenario, the door will be unlocked.

In the med lab, there is a first aid spray on the bed in the prototype, which was removed from the final. There are some shading differences with some of the walls, such as at the right.

In the prototype, there are two plant 43s in this room, whilst in the final, it's two of the evolved plant 43s. In the prototype, these two enemies are both waiting around the corner, whilst in the final, one of them was moved to be in front of where the light switch is.

For this background, the lighting was changed, and a computer console was added to the middle machinery. There is a working light switch in both versions, but the final makes it more obvious it's there by adding a red light onto it.

When the lights are on, there is some lighting differences between versions.

In addition to the background differences, the screen is also shaking at this point in the final, whilst it doesn't in the prototype.

The cutscene where Claire contacts Leon is slightly different, with some camera angles changed for the final version.

In the prototype, "Escape from Laboratory" is playing during this cutscene. In the final, it plays after the cutscene ends.

In the save room, there is some magnum ammo on the desk in the prototype, which is impossible to obtain -in the B scenario, you only go into this save room as part of a cutscene, so don't get to control Leon. In the final, the magnum ammo was removed. This also applies to the ink ribbons next to the typewriter.

Leon also walks towards Sherry in the prototype, and runs in the final.

To the left, you can see part of a green herb in the prototype, which is again impossible to obtain. This was removed from the final.

When you enter the elevator, it's all a cutscene in the prototype -you don't have to do anything. In the final, you have to go to the computer at the back, and use the key.

Note the monitor on the right wall of the prototype, which isn't there in the final.

The prototype displays these pink square graphics, in the final these were replaced with green rectangles. The final also displays text here to make it clear as to what's going on.

There are no lights above the elevator door in the prototype, but there are in the final.

When you regain control of Leon, some of the windows on this part of the train were given duller colors for the final.

In the prototype, "Left Alone?" plays here. In the final, "Escape from Laboratory" continues to play.

If you go to the very front of the train, the gates are already open in the prototype. They're closed in the final.

Parts of this background were brightened up for the final.

The door animations for the doors leading in and to the back of the train were altered for the final.

The back of the train had several changes made to it for the final version, the biggest change is that the final adds a typewriter and item box here, which the prototype doesn't have. The final also has the platform key on the floor here, which isn't in the prototype at all -it's not needed to progress.

In the prototype, "Raccoon City" starts playing here, whilst in the final "Escape from Laboratory" continues to play.

Some details on the front of the train were altered for the final.

The console next to the gate had a red light added to it for the final. Note that the gates are shut here in the prototype, yet they weren't earlier.

The prototype has a glitch were part of the gate overlaps the left wall for these two backgrounds. This was fixed for the final.

This door was slightly amended for the final version. In the prototype, it's unlocked from the start, whilst in the final, this door requires you to use the platform key to unlock it.

There is an issue with these backgrounds in the prototype, where the bars covering up the joint plugs (located over the bridge) overlap the train. This was fixed in the final.

A 5 minute countdown starts at this point in the final, but it doesn't happen in the prototype.

The prototype has no music playing during this section, whilst the final is still playing "Escape from Laboratory".

The final added an arrow to the floor here.

Under the bridge, the prototype has a typewriter here, which the final removed. The item box was slightly altered, and some pipes on the train were changed.

This is another background in the prototype that has the bar overlap issue.

The final adds another arrow here.

The prototype does not have the red light on the console that the final has here.

When you reach the Mr. X fight room, the prototype has a cutscene start, where a voice says "10 minutes until detonation". No timer appears on screen though. In the final, the cutscene just has a rumble sound played, and that's it. The timer, which is only 5 minutes, started earlier.

The backgrounds for this room look slightly darker in the prototype than they do in the final.

There is a tiny difference with part of this background -look at the black hole above the red girders, you can see it was slightly changed for the final.

Again, the prototype lacks the red light on the console that the final has.

When Mr. X appears, the prototype still has no music. In the final, "T'-B" starts playing.

When Ada drops the rocket launcher, the prototype has a glitch where her feet overlap the platform she's standing on. The final fixed this.

In the prototype, Leon does not move his arms when he says "Ada, is that you?" ADA!", but does in the final.

In the prototype, the rocket launcher seems to float instead of hitting the floor, the final fixed this.

In the prototype, the rocket launcher has 4 rockets, whilst in the final, it only has 2.

After Mr. X has been destroyed, when you return to the train, there are no zombies in the prototype. In the final, five zombies were added.

The console next to the gate still lacks any lights at the point in the prototype, whilst in the final, it'll have a blue light on it in addition to the red one.

When the gates open, the final mirrors this shot of the train.

And for the grand finale of the exciting gate console light trilogy, the prototype still has no lights on it, whilst in the final, the red light switches to green once the gates have been opened.

When you go back into the train and power it on, the prototype then plays the FMV of the statue from the RPD opening up. In the final, the correct FMV plays.

When you head to the back of the train, the prototype starts a 5 minute timer. In the final, it's a 2 minute timer.

You can get to the very back of the train in the prototype. In the final, once you get to a certain point, a cutscene starts playing, where the final boss enters the train.

When you head back to the front of the train in the prototype, a cutscene will start -Leon will stop, look behind him... and then it freezes. Unfortunately, the prototype crashes here, I would guess that the final boss isn't in the game at this point, causing it to crash. The final version has the final boss appear and chase Leon down the train.