Continuity mistake: Rachel throws a couple of suitcases and Jamie throws 2 more and a sleeping bag down the stairs. Next shot shows a chair and boxes that were never thrown. (01:08:10)
Continuity mistake: Pay close attention to the scene at the end of the movie when Sheriff Meeker and several other troopers start shooting Michael. As the shots are being fired by multiple men, you will notice one of the troopers on the far left side of screen (blue/white flannel shirt, beard) lighting a stick of dynamite. As the shots pan back and forth between the troopers firing their shots and the shots hitting Michael, you will see this same trooper continue to keep lighting the dynamite. A few seconds later in the sequence while more shots are being fired at Michael, you will now see that same trooper now suddenly holding (and about to put down) a shotgun, the dynamite is now nowhere in sight.
Continuity mistake: When Dr. Loomis is thrown through the window by Michael Myers in the school notice that Myers' hair has strangely turned white. The next shot Myers' hair has gone back to being brown. This is more evident in the widescreen version. This was due to a reshoot. Originally the film was going to go with the white haired wig, but then changed to the dark hair wig. Obviously one scene was missed in editing.
Continuity mistake: Myers at the end rips Rachel's shirt on the sleeve when she is driving the truck, right after he rips it, it is together again, he rips it again, then it is together again.
Continuity mistake: Rachel dumps a cup of coffee on Sheriff Meeker's daughter's white T-shirt in the kitchen yet there's no sign of a stain. It's not even wet.
Continuity mistake: In the trick or treat scene, Rachel's purse disappears then reappears when she runs from Michael.