Continuity mistake: When Tommy goes back to the bus depot, he finds a blood trail that was left by Jamie when she died the previous night. Tommy's there during the day or early morning and when Tommy finds the blood in the sink, he touches it and it's still wet. Blood dries in only 4 minutes so it couldn't have been left by Jamie.
Continuity mistake: Tommy goes to the bus station and a map of the towns of Illinois appears on the wall. Notice that Haddonfield and Smiths Grove (150 miles apart in the film) are located in between Pontiac and Dwight which are 18 miles apart in reality! That's how far apart the Amtrak stations are from each other according to the Amtrak timetable/schedule.
Continuity mistake: In the scene where Michael Myers impales the nurse's head on a spike in the darkened hallway, we first see Michael walking mysteriously out of the darkness & in plain sight of the nurse. Then the camera angle changes to Michael's POV and he doesn't see the nurse until he walks around the corner.
Continuity mistake: In the opening of the original Halloween, the backyard of the Myers house is level with the back door leading to the kitchen. In this movie, the kitchen door is accessed by steps showing that it is high off the ground, and also means that the house is on an embankment. If this is true, why does Kara walk on completely flat ground while going by the side of the house?
Continuity mistake: When Tommy is on the phone with Barry Simms, he holds the phone and types on his keyboard with his right hand simultaneously.
Continuity mistake: In the original film, the Myers house is very tall and thin, with skinny support posts on the porch and only 2 windows on the second floor. It is also lower to the ground. In this movie, the house (which is supposed to be the same) is considerably wider, with large supports on the porch and is higher off the ground. There is also enough room on the 2nd floor for the addition of an entire balcony.
Continuity mistake: When Kara, Danny, and Tommy are running from Michael, they go into the room with the dead fetus'. Kara locks the door, with there being two locks on the door (you can hear her locking both of them). But, when Michael punched the door and rips the door knob, you can see that there are two locks on it and only one hole for the bottom one to only lock. How did Kara lock the door when the upper one didn't even go to another lock?
Continuity mistake: When John Strode goes downstairs, his hair goes from dry, to moist/wet looking and hanging down.
Continuity mistake: As the film progresses towards the third and final act, Michael's body goes from large and muscular to lean and thinner. No attempt is made to hide this. The reason is because the director decided to change the ending but didn't bring in the original actor, instead choosing a second one whose body doesn't match.