Audio problem: When Harold is talking about Michael's past, his lips are not moving as he says that Michael killed three nurses and a paramedic.
Revealing mistake: When you see Freddy's car parked outside the Myers' house when the trunk is open,you can easily tell that the background is artificially created and there is a wall at the side with painted clouds. (00:27:20)
Continuity mistake: When you see Sara driving up the school path on her moped you see a lonely girl sitting on a bench and when it changes to the next shot she is gone.
Revealing mistake: After the hallway camera cuts out, it eventually comes back on the computer screen that Deckard is looking at. If you look at the landing and the stairway, the picture is reversed. (00:40:05)
Plot hole: What exactly was Laurie Strode's plan in the teaser, when she strung Michael up over the edge of the roof. From the way she starts cutting the rope it looks like she plans to drop him, but she's seen him survive a 2-storey fall before, in the original Halloween, not to mention multiple stab wounds in H20. A fall off the roof into bushes would barely phase Michael.
Other mistake: This is a timing mistake. In the beginning of the movie, when Michael kills the first security guard, he stuffs his head in the washer. The second security guard was in the room within 30 seconds. There is no way that Michael had time to cut this guys head off, stuff it in the washing machine, turn it on, and hide before the second guard got there.
Plot hole: When Michael kills Rudy all of his knives are now gone but when he chases Sara around the house he has another knife with blood on it. Where did he get the other knife from? (01:04:30)
Continuity mistake: At the start of the film after the crazy guy is pushed out of the room Sara says, 'I just need to send a quick e-mail.', and when you see her type it in there is a really long word or sentence on the screen but in the next shot close up there is just the word 'Deckard'. (00:19:40)
Continuity mistake: In the scene when Rudy has the last last knife stabbed through him about fifteen centimeters of the blade go through the other side of the door. About fifteen seconds later from the fitted camera view you see Michael open the door and Rudy has a large, thick padding on his back. There is no way the knife could have gone that far through the other side of the door if the padding would have been that thick. (01:04:20)
Continuity mistake: After Deckard receives the e-mail on his computer he writes about three lines below but about five seconds later when you see the computer screen he is just beginning the sentence on the first line. (00:19:55)
Revealing mistake: When Dr Mixter is talking about Carl Jung in the classroom the camera pans over the students and if you look at the blonde girl with the pink sweater on she stares at the camera for about a second. (00:16:35)
Continuity mistake: When the six enter the Myers' house outside you see Sara walk through the doorway and nearly reaching the stairs but about five seconds later she is just entering the doorway. (00:31:25)
Continuity mistake: When Nora is making her coffee from the machine you can see most of the computer screens. If you look at the one with Charlie on it you can see him walk backwards with the tripod leg pointing at him, but in the next shot,when you see the screen close up, he is kneeling down, Michael Myers catches his attention and then he stands up. (00:28:30)