Revealing mistake: Toward the end, after Ricky decapitates the old Mother Superior, a young nun assumes she is alive and taps her shoulder. Mother Superior's head falls off and to the floor. There is no blood whatsoever. The old woman had just been decapitated moments earlier, and there isn't even a drop of blood, not even on the white part of her nun outfit at the neck.
Revealing mistake: You can tell Chip's head is a dummy's head when Ricky electrocutes him with the jumper cable.
Revealing mistake: When Ricky shoots a car coming down the road, in the far shot of the car flipping over it's obviously Eric Freeman's stunt double, because the stunt double's hair is bigger and fluffier than it should be.
