When Buddy's first victims are shown in the freezer, they change positions in the shots that follow.
Blood is shown pouring down from Harold and his trousers are bloody before he is shown being hurt.
When Harold is shown the victims, the dead bodies are obviously breathing.
When Buddy's first victims are shown in the freezer, in one the shots they are clearly breathing and therefore hanging alive.
Obvious doll when old man is killed by a car at the end of the movie.
Obviously fake hand when Buddy is holding Dave's cut off hand.
Dave's lover mistakes Buddy for Dave, but it doesn't make sense as he passed her in the car, she would have seen it's not him.
When Liz is looking for Annie and the boys in the slaughterhouse near the end of the movie, she calls for Skip, but her mouth doesn't move.