Visible crew/equipment: When you see the two women at the mental institution, the camera angle is at their backs, the woman on the left is curious about Michael Myers. Before the other says that she decapitated a man, you see down the end of the hallway a man kneeling down, possibly a crew member. In the next shots of the hallway, he is gone. (00:03:10)
Visible crew/equipment: When Michael Myers enters Harold's room at the institution and hands over the knife Harold says, "Michael Myers". If you look carefully on the wall on his right you can see shadows of camera equipment and wiring and also when he is walking past the window you can see a reflection of a camera. (00:14:45)
Visible crew/equipment: When you see Freddy's black Voyager parked outside, a green Jeep passes by the car. If you look carefully at the reflection there is a large,high ceiling of a warehouse stage set. (00:27:25)
Visible crew/equipment: When the contestants are on the Myers porch, putting on their cameras, a webcam shot reveals a large portion of the soundstage the house was built in. (00:32:00)
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)
Visible crew/equipment: Just after the garage has burnt down the police arrive and if you look very closely on the windshield of the first you can faintly see a camera crane lowering down. (01:18:00)
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)
Visible crew/equipment: At the beginning, when Michael kills the first security guard in the basement, just before he dispatches the second one, you can see a crew member's arm reflected in a window hitting the light shade to keep it swinging.
Visible crew/equipment: There's a cameraman visible when the two guys walk into the house party. He doesn't belong in the scene and is filming.
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.