[After Michael falls off the balcony] Laurie: Was that the bogeyman? Dr. Loomis: As a matter of fact... it was!
Laurie: I saw Mr. Riddle in his backyard, he was watching me. Annie: Mr. Riddle was watching you? Laurie! Mr. Riddle is eighty-seven! Laurie: He can still watch. Annie: That's probably all he can do.
[Referring to a partially eaten dog.] Sheriff Brackett: A man wouldn't do that. Dr. Loomis: This is not a man.
Sheriff Brackett: It's Halloween, everyone's entitled to one good scare.
In the beginning of the film when Michael reaches for the knife and later for the mask, his hands and arms are visible. They belong to producer / screenwriter Debra Hill.
Inside Laurie's bedroom there is a poster of a painting by James Ensor (1860-1949). Ensor was a Belgian expressionist painter who used to portray human figures wearing grotesque masks.
Halloween was shot in 21 days in the spring of 1978. Made on a budget of $300,000, it became the highest-grossing independent movie ever made at that time.
Morgan Strode's black Fleetwood (seen in the driveway when he is talking to Laurie early in the movie) belonged to director John Carpenter, while the Phelps Garage truck was owned by the company that catered for the film.
The character of Michael Myers was named after the European distributor of Carpenter's previous film, Assault on Precinct 13 as a kind of weird "thank you" for the film's overseas success.