Revealing mistake: When Richards attacks Kowalski and the other crewman in the electrical room, he makes contact with the bulkhead, smearing it with the makeup from his arm.
Revealing mistake: Set lights are reflected off the supply room door when Kowalski, Crane, and Sharkey drag Richards into the room.
Revealing mistake: The metal bulkhead of the electrical room is obviously paper when Richards breaks through.
Revealing mistake: After Richards strikes the doctor and opens the door to exit Sick Bay, the smeared makeup from Richards' fingers is visible on the door and door jamb from previous takes.
