Revealing mistake: At the start after the main title appears you can see the outside of Haddonfield University and you can easily tell that the building is a digital composition. (00:16:10)
Continuity mistake: When Bill talks to himself in the mirror Michael bursts through the wall and grabs him but after you see the quick scene with Freddy and Nora having their glasses of wine Michael is completely out of the wall when he stabs him. (00:43:30)
Continuity mistake: Halfway through the film, we see Michael Myers walk into a room immediately followed by another Myers. Both are dressed nearly identically in a blue jumpsuit. But as soon as the first one turns around and we learn it's actually Freddie, the shot changes to Michael and back to him and he's wearing his jean jacket, seen in the rest of the movie.
Visible crew/equipment: At the end of the film one of the news reporters asks how Freddy is feeling at the moment - when he says this you can see a black object covering half of the screen. (01:19:40)
Plot hole: Bill was killed in Judith Myers' bedroom, but his body was discovered on the stepladder leading to the attic. Wouldn't there be a noticeable trail of blood leading from the bedroom to the attic? Michael might hide bodies but he doesn't clean up after himself.
Continuity mistake: Near the end of the film, Deckard is communicating to Sara's handheld device where Michael Myers is in the house. When Deckard tells Sara to "GO NOW!", the text has changed from small digital text to large bold font and the screen has changed from green to white, similar to a large PC monitor.
Continuity mistake: Freddie has all the cameras cut when they find out he's a fake Michael Myers. When the kids complain to Deckard about it suddenly going offline, they tell him to bring it back. Deckard types at a fast rate, yet not only is there no dialogue box for text to be typed in, the screen remains the same.
Continuity mistake: Nora picks up her phone twice before she makes the call to Freddy in the garage, whilst Charlie is getting killed.
Continuity mistake: When Sara is riding up the school pathway on her moped,beside her you see a boy pulling his bike along approaching his friends and he is about half a meter away but in the next shot the boy with the bike is about two meters away from his friends. (00:17:05)
Audio problem: At the start, Sara is driving her moped at the school. Jen arrives and asks, 'Guess what?' Then she says, 'We gotta find Rudy. Come on.' When she says 'Come on,' her mouth doesn't move. (00:17:20)
Continuity mistake: After Willie sees his partner's head in the washing machine, he panics and walks backwards. He trips over the dead body of his partner, he falls over his body and his arms are straightened out, but when you see him next his arms are straight against his waist and hips. (00:09:25)
Continuity mistake: When you see Freddy being interviewed you see Nora watching him on the TV, the camera is at a reverse angle and you see that her hand is somewhere round her face and her head tilts but in the very next shot,she doesn't have her hand near her face and also her head is completely still. (00:30:30)