Factual error: When Dr. Loomis is at the pay phone talking to someone at the mental institution, the background of the scene has mountains, which in fact Illinois does not have any mountains.

Revealing: When Bob and Linda arrive at the Wallace house, the exterior shots show the doorknob on the front door to be on the left side which would mean the door would swing inward to the right. However, when the shot cuts to the inside of the house as the door opens, the door swings inward to the left and the doorknob is now on the right side.

Continuity: Laurie's hair keeps changing throughout the movie. Her hair changes from wavy to straight while she babysits the kids. It is wavy again when she is going to Lindsey's house, and straight again when she is running back to Tommy's house. It stays straight until Michael starts to strangle her,where it becomes wavy again, having been straight in the previous shot. It all ends with straight hair. Surely all of this could not happen in a matter of hours.

Revealing: During the scene when Michael steals the station wagon from Dr. Loomis and the nurse, when she is lying across the seat you can see the passenger window is clean and very much transparent. However in the very next scene where Michael goes to smack his hand on the window, it is now foggy - a side effect of the glass alternative used for the effect.

Visible crew/equipment: During the opening sequence, the scene is shot in first-person point-of-view from the young Michael Myers. As he walks through the house, the shadow of the camera can be seen several times. After he picks up the knife in the kitchen, the camera's shadow is visible on the door frame leading into the dining room. It can be seen again just before he turns to go upstairs.

Continuity: When the girls are walking home from school, Annie says that she is babysitting Lindsey Wallace and Laurie says she is babysitting Tommy Doyle. Laurie also claims that the Wallace's and the Doyle's house are 3 doors down, but when Annie drops Laurie off the houses are right across the street from each other.

Continuity: At the very beginning, Michael Myers' sister and her boyfriend "go upstairs." Michael then sneaks around the house, picks up a knife, and follows them. As he is about to go upstairs, his sister's boyfriend leaves. He then proceeds upstairs, and finds his sister nude. The actual time elapsed from proposition to his exit is about one minute and fifty seconds. Is this really enough time to go upstairs, get undressed, go about your business, and get dressed again?

Other: When we see the Wallace house from the outside, the front door is on the far right hand side. Yet when Lynda and Bob walk in later on, they enter the house through the front door, and the living room is on the right when it should be on the left.

Other: Right after Annie is killed, her eyes close and then open right back up again. It's like she forgot that she had to keep her eyes open for a scene later in the movie.

Factual error: When Laurie and Annie are on their way to babysit, and they see Annie's dad, the cop, as soon as they pull up to say hi and roll the window down, he mixes the two names up, and calls Laurie Annie, and Annie Laurie. You'd think he knows his own daughter's names.

Continuity: In the scene where young Michael Myers sees the clown mask, the closest piece of clothing is a red shirt. When he puts it on, the closest piece of clothing is now a blue piece of clothing.

Continuity: There is a scene that's supposed to take place at 6pm and it's still very light out. At the end of October, it's dark by 5 pm.

Deliberate "mistake": The opening camera scene, that's supposed to be shot from Michael's POV as a child, is too high as noted that he's almost face to face with his parents at the end of the scene and then is only mid-chest up to the father when he removes the mask.

Revealing: In the scene outside of Smith's Grove mental institution, where Michael jumps on top of the station wagon, he attacks the nurse, but she manages to wrangle free. A few moments later, he smashes the passengers side window. If you look closely, the actor's arm has a wrench taped to it in order to effectively break the glass injury free.

Continuity: In the beginning, when the doctor is talking to the new nurse for Michael in the car, the nurse is smoking a cigarette, but seconds later she has just lit one up. If she smokes one in 45 seconds then lights up another she is one worst chain smoker I've ever seen.

Continuity: When Lynda is talking about how she forgot her books (at the beginning of their walk home) we see Michael Myers drive by, then speeds up and drives passed a driveway, then it cuts to Annie (Myers is still driving) and she says, "Hey Jerk. Speed Kills." We see Michael driving again and he is just a bit behind the drive-way he drove by before, he should be much farther ahead down the road at the speed he was going.

Continuity: In the beginning of the movie, Laurie runs into Tommy while she is walking to school, meaning that they live near each other; however, later on in the movie, when Laurie has to babysit Tommy, Annie has to drive her to Tommy's house, which is located on the other side of town.

Continuity: When Laurie is in the closet she stabs Michael with the hanger and leaves it up there. When they show all the locations at the end of the movie, in the shot of the living room look near the floor up close - you can see part of the hanger there, even though it was left upstairs.

Factual error: In the scene when Laurie gets stabbed by her bro Michael in the arm she falls over the banister the camera shows a view of what she sees, falling at that angle Laurie would have broken her neck, spine and hip. But it is still weird how she managed to turn 180 degrees in such a short fall.

Continuity: After Laurie has been spooked by seeing Michael behind the bush she keeps walking and stumbles into the sheriff. If you look at her expression as she turns and yelps in "fear" you'll notice she's laughing! She even puts her hand over her mouth to hide it.