Continuity: The wall behind Michael changes as he takes the gun away from Brady. First, there is a solid wall with decorative hangings, then there is a shot of the front door, then the solid wall again.
Continuity: Michael reaches into the truck and rips Rachel's sweater, but in the following scene, Rachel's sweater miraculously returned to normal, buttoned and all.
Crew or equipment visible: The cameraman is reflected in the window when Dr. Loomis runs to the window to look for Michael.
Continuity: Michael's full name is Michael Audrey Myers yet in the mental hospital when someone is typing his name on a form they write Myers, Michael M (possibly character error).
Continuity: Michael's hair from the mask changes from straight messy brown, to full curly blond when Loomis is thrown into the glass doors.
Continuity: In the Vincent Discount Mart when Brady and Rachel are talking, Brady says that the time is 5:00. Jamie just got out of school so it has got to be around 3:00 or 3:30.
Continuity: When Dr. Loomis parks his car outside of the filling station, he stops past the last gas pump. The next shot shows his car much closer and he tries to fill it up.
Continuity: As Rachel and Jamie slide down the roof, they look down and a bike can be seen on the ground. When Jamie ends up running to Rachel later on, the bike is no longer there.
Revealing mistakes: If Michael was shot in the eyes in Halloween II, why are his eyes intact in this one?
Continuity: Rachel's purse disappears and reappears when she sees Michael and runs from him, while she is looking for Jamie.
Continuity: When the camera is at Michale's back once he get hits by the truck the truck is stopped, but in the next shot the truck is still moving.
Continuity: The blue sedan Dr. Loomis parks at the pumps outside the gas station is different than the one that blows up minutes later in the same location during a fire. The vehicle he parks is a 1982-1983 Chevy Malibu with four headlamps and one kind of grille. The vehicle that explodes in the fire is a 1980-1981 Malibu with two headlamps and a different grille.
Revealing mistakes: A shot is reused when the men in the pickup hear the school alarm. Unger beats on the roof of the truck and mouths "There he is!" again, just as he did before they killed Ted Hollister.
Factual errors: When Loomis and the sheriff are surrounded by the teens dressed like Michael Myers, Sheriff Meeker say's "If I catch you it's a weekend in jail" indicating that it's a Friday. Halloween was actually on a Monday in 1988.
Plot holes: Michael got his overalls from a mechanic he killed by impaling the guy with a metal rod in the chest area. Yet there is no blood or holes on the coveralls.
Continuity: The burn scars on Dr. Lommis' face change periodically throughout the movie. There is a dramatic change from when he is riding in the truck with the preacher on his way to Haddonfield compared to when he arrives and comes into the police station.