The photo room is a nonexistent room with an ID of photo booth, a bunch of blanked out code mentions Photo Booth as a destination. This is room 15, a creepy room that isn't blanked out in the games code, it might be accessible in game bit it could just be unused but not blanked out. I'll look for room 14 and 16.
Also, the room numbers are not a order of where to go, they are IDs that get used by doors to find a destination to transport to. Room 1 could be connected to room 57. Rooms can also be accessed by strange methods. If you bump into the sharks stool in the lobby while you are a cat fish, you will be teleported to another room within the lobby.
Edit: room 14 is the fluffy dudes room and room 16 doesn't exist.