Other mistake: When Sid committed suicide, the coroner brought him out of the office...not his room.
Other mistake: In the Ring Game, Flynn throws a shot that Crom catches and returns. When the shot hits Flynn's rings, it takes out the third and fourth ring. Problem is that any other time, the impact only takes out the ring that it hit. Close inspection shows a solid hit on the fourth ring only. The only explanation is that since Flynn continues and jumps the "gap" in the rings, this was a deliberate set up to bring the end to this sequence and move the movie forward.
Other mistake: When the hunter throws his cross-x at the witch's backside, the witch screams a second before it even makes a strike sound. And when he goes to pull the cross-x out in the far shot, there is nothing in her back.
Other mistake: While Coach is with Miss Honeycutt (aka "Lassie") in the boy's locker room, her exaggerated "oohing" and moans permeate throughout the gym, but do not match their actual sex movements during the camera cuts and she still carries on even when the action is paused.
Other mistake: Towards the end of the movie when Paul Kersey goes into the doctors' locker room to steal an ID tag, he checks several lockers to see if they will open. All the lockers that he tries are unfortunately locked. The problem is there are no locks on any of the lockers. (01:13:55)