Deliberate mistake: When Sarah, et al are surrounded by the Goblins in Goblin City, the first cannon fires causing an explosion in front of some buildings, one of which has a hanging sign with scissors on it. Later, after the squatty Goblin says, "Hey! I just fired you!" another cannon fires causing an explosion, and the very same shot is shown, only the first one was flipped. (01:20:15 - 01:25:35)
Deliberate mistake: There's a bizarre editing gaff in the opening fight of the Director's Cut. At one point, Fasil's sword vanishes (for no real reason) and he starts to do backflips. The scene then cuts away, and when it cuts back, he's suddenly running and has his sword again. A few shots later, he's suddenly doing backflips and has lost his sword again. (It's meant to be Fasil doing the flips.) The editing makes absolutely no sense. It's like they somehow mixed up two different scenes during editing.