Audio problem: When Sara enters the large room with the meeting with Freddy, Jen comes up to her and says 'Sara,' but her mouth doesn't move. (00:20:55)
Continuity mistake: The second after Jen gets her head sliced off you see her body is still standing but in the next shot when you see her head rolling down the stairs her body is laying flat on the landing. (01:01:15)
Continuity mistake: When Jen and Bill are walking up the stairs on their way to Judith Myers' room, Jen accidentally trips and breaks a step halfway up the stairs. After she says, 'Hands off,Bud,' she walks away from him about two steps, but in the next shot she is only three steps away from the top. (00:37:55)
Revealing mistake: When Deckard and his friend are in his bedroom on the computer you see a window beside him and outside you can see that there are painted clouds on a wall. (00:20:20)
Continuity mistake: When you see Donna, Jim and Rudy approaching the house to get ready you see that they are the only ones on that side of the house. You can tell because the wall is on their left side, but in the next shot you also see Bill on the same side. Where did he come from? (00:30:35)
Continuity mistake: After Willie trips over his beheaded partner his torch is in his left hand but after Michael Myers slices his throat and falls down his torch is in his right hand. (00:09:35)
Continuity mistake: When Deckard is at the party he goes up to the opening doors and tries to sneak in. Inside you can just see a lamp and a few bronze pots on the floor but when he enters the room you can see lots and lots of furniture and objects in the room. (00:36:15)
Continuity mistake: At the end when the garage is on fire Freddy shouts out, 'Happy F*****g Halloween', and when you see Michael caught up in the wires there are hardly any on his left side but when you see him from the camera there is a whole load of them surrounding him. (01:17:55)
Continuity mistake: When Michael Myers stabs the first two knives into Rudy and it goes through the door he gets the other one out of the drawer which is about three meters away but when he actually takes it out of the drawer and stabs it through him the drawer is like fifty centimeters away. (01:04:10)
Visible crew/equipment: Near the very end when Sara is walking through the tunnel in the house, the camera angle is in front of her. To the right, just for a split second, you can see someone's hand moving down very quickly. (01:12:50)
Continuity mistake: Near the end, Sara tied a camera cord round Michael Myers's neck. Then, he throws Sara onto the bed and breaks the wooden panel beneath it. In the next second, you see it again completely undamaged. (01:09:50)
Continuity mistake: When there is a four-way split-screen while they enter the house, the top-left, the bottom-left, and the top-right don't match properly. (00:31:55)
Revealing mistake: Freddy's car is parked outside Michael Myers' house twice. First, when the trunk is open with the adapted machine and then he parks on the other side of the road after Charlie gets killed. (00:27:15 - 00:30:00)
Continuity mistake: After Sara sees the reflection of Michael Myers in the mirror, Jen is beside her. Jen turns her head to Donna when Donna says, 'The bogeyman?' In the next shot, Jen turns her head again. (00:25:10)
Continuity mistake: At the start just after Willy sees his partner's head in the washing machine, he gets his throat cut and there is blood all over the knife. Later on when Michael is approaching Laurie's room, his knife just has blood on the tip, only halfway up the blade. (00:09:35 - 00:10:20)
Continuity mistake: When Sara gets locked in the closet after the mannequin falls on her, we see Rudy's fist bust through the closet door, as if there were no other way it. In the next shot, the closet doors are wide open.
Factual error: The rat that Michael Myers supposedly ate that the redhead touched was able to move and squeak despite its lungs being torn out of its body.
Continuity mistake: Throughout this entire film, the interiors of the Myers' house are huge, compared to the small two story frame house exterior.
Audio problem: At the very end of the film Sara wants the fireman to open the bodybag with Michael Myers in it. When he does Freddy says,'Uh oh.', and as he says this the words do not match up with his mouth movements. (01:20:25)
Continuity mistake: When Sara escapes out of Michael Myers' bedroom window she looks over to the garage and when you see the crowd at the party and there are about thirty people but in a span of 30 seconds there are about twice as many in the room. (01:06:35 - 01:07:05)
Answer: Or maybe he's thinking that his mission to kill Laurie is done. He's been trying to kill her for a long time and succeeded. No need to continue, but when those kids invaded his house, the killing began again. No one goes into his house, but him.