Continuity: In the scene when Michael is carrying Annie's body into the house her head is on the left side of his body. After they show the boy looking out the window they cut back to Michael and suddenly Annie's head is on the right side of his body.

Factual error: Even though the story is set in Haddonfield IL, all of the cars have California license plates.

Continuity: In the closing credits, Michael Myers is said to be 23 years of age, he was actually 21.

Revealing: There is a scene where Michael Myers is hiding behind a hedge bush and Laurie and her friend go to investigate. Laurie turns around and talks and you see cigarette smoke go by the camera. It came from one of the camera crew members shooting the scene.

Continuity: When Laurie is beating on the door to Tommy's house and telling him to open it, the door knob is on the right side of the door. When it shows Tommy opening it from the inside, the door knob is also on the right side (it should be on the left).

Continuity: When Laurie is walking home the sidewalk instantly goes from wet to dry.

Visible crew/equipment: Just before Laurie stabs Michael with the knitting needle you can see that one of the window shutters is open and that the wind is ruffling the curtain. When the camera gets closer and the curtain is out of the way you can see the huge fan in the studio being used to simulate the wind outside.

Continuity: There is a scene involving Michael Myers breaking the closet in order to get to Laurie, then why near the end of the film does it show you the closet in tip-top condition?

Visible crew/equipment: When Annie is locked in the laundry room, there's a scene where the phone is ringing incessantly and the camera pans slowly to the right showing little Lindsay Wallace who's too busy watching television to answer the phone. If you watch this scene in widescreen, you'll see a crew member lurking in the shadows (left side of the screen) on the wall. It appears they are trying to avoid being seen.

Plot hole: Why didn't Doctor Loomis notice Michael's car until it was almost to late? The car was parked right across the street.

Continuity: In certain shots, you can see that the William Shatner mask had not been fully painted white, because you can see the flesh coloured neck, but in other shots it is fully painted.

Continuity: When Annie drops Laurie off at Tommy's house the front door of his house is glass, but later it is a plain door.

Continuity: In the scene where Tommy Doyle looks out the window and sees the shape outside of the house across the street, the porch light is off and the jack o lantern is not lit. When he attempts to show Laurie, the next shot of the house shows that the porch light is on and the jack o lantern is lit.

Continuity: Toward the end of the movie, Dr. Loomis comes up the stairs and starts to shoot Michael six times, sending him spiraling to the terrace. Take notice that Michael is about to go over the ledge of the terrace head first. In the next shot it shows him carefully backing off the ledge, while facing the house.

Continuity: After Laurie asks Annie what she is going to wear to the dance (while Annie is driving with Laurie), we see Annie turn the steering wheel to the left, yet the car turns right as seen on the green screen in front of them. As the car is turning right, it cuts back to Annie still turning the steering wheel left.

Continuity: In the scene where Laurie comes downstairs after taking a shower, she is at her front door singing to herself and she is looking out a window directly to the left of the door. Then there is a shot of the front of her house outside and you see her exit through the door that had the window next to it, but there is no longer a window there.

Factual error: It's supposed to be late autumn, but in most scenes the leaves are still very green. [This is because it was shot in California during the summer. Carpenter imported leaves for every shot that you saw leaves blowing on the ground and blew them with a giant fan (this also killed any ambient sound takes); there are also a few shots where you can see palm trees (most prominent the one right in the front yard of Michael Myers' house).]

Revealing: When Lynda almost trips/stumbles on the floor after her phone call with Laurie, she trips over the dolly track. They revealed this fact on the director's commentary.

Continuity: When Laurie is in the bottom of the closet hiding from Michael, you can see that a purple dress is in front of the rest of the clothes. However when she stands up to grab a hanger, a pink sweater is in front only to be behind the purple dress again when she sits back down.

Revealing: In the scene where Dr. Sam Loomis is calling from a pay phone warning of Michael Myers return to Haddonfield, a Southern Pacific freight train passes by blowing its horn (you can't see the train in the standard version). While SP trains are quite common in Southern California where the film was made, they don't actually travel through any part of Illinois.