Continuity mistake: When Harris is briefing the new group for the first time, Hightower loosens the leg of Harris' chair so that it breaks when Harris sits down. When Harris gets up from the middle of debris, the next shot shows an innocent looking Hightower and the chair is intact in front of him.
Continuity mistake: When Commandant Lassard and Sgt. Fackler enter the bar, Lassard plays pool with one of the customers. Lassard pockets the 9-ball two times between the shots, even though it is the same ongoing game.
Continuity mistake: Does the poisonous gas seem to clear out of the room where Sargent Lasard is trapped in too quickly or what? They were only outside for a couple of seconds and then when they enter the room its as clear as can be, as if nothing had happened.
Revealing mistake: When commandant Lassard and Spacler walk into the bar all the guys in there throw their weapons behind the counter, but if you look at the weapons they're all plastic props.