Visible crew/equipment: In the scene where Julian Sands confronts Paula Marshall on the holy druid site, there is a shot where he pushes a Stonehenge-like boulder over in an attempt to crush Paula Marshall. As the boulder topples over, behind it you can see the heads of the crew members who are doing the actual pushing. (01:24:25)
Revealing mistake: Right before Alex and Tommy are about to leave for their date, Walter is playing Tetris. When he puts down the control to come talk to them in the kitchen, the game keeps playing and you can see the pieces moving and turning.
Continuity mistake: When Hexina falls to her death, she's falling face down. When a close up shot is shown, she's lying on her back.
Continuity mistake: In the scene where Ellen and Newland are seated in her living room by the fire, we see her take a cigarette holder charm off of her bracelet. Then, the next scene shows a closeup of the cigarette holder charm, and she is again removing it.
Continuity mistake: When Susan defeats Delores Hernandez in their karate championship match, she's lying on the mat, head turned to her right. A quick shot of one of the judge and suddenly Hernandez's head is turned to her left.
Continuity mistake: Julia is apparently being helpful towards the stranger at the door. She is taking notes as he says his name and auto club card number. She is casting a visible shadow on the door, entirely gone in the close-up of the door itself. (00:08:15)
Plot hole: In the scene in the hotel, David sees the victim's head on the floor after the killer left. Later when David is in a hospital bed he is watching TV and the reporter claims that all the heads were in Judd's car. The killer would have had to have gone back into the hotel room to get the head of that victim after David saw it. She would have put it in her bag right away if she was saving them all. The bag was even left behind. (01:12:30 - 01:25:00)
Continuity mistake: The two buddies are eating and listening to the exposition news item about the "Zone of Personal Freedom." In the last part of the scene ("Who do you suppose are gonna call to clean that up?" the straw inside Chad McQueen's milkshake keeps swapping position between the middle and the rim of the glass. (00:03:20)
Revealing mistake: When Michelle Yeoh is about to hit the basket on the fire truck you can see her safety wire.
Continuity mistake: When Bob tells Junior that Larry is a cucumber, the carpet and the shadow of Junior's bed shift to the right a little bit.
Continuity mistake: When Max chases the cat up the tree, in the close-up where you see Max's claws grow, the tree bark texture is different from the shots before and after.