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Back to the Future trivia
Michael J. Fox is only ten days younger than Lea Thompson, the actress who plays his mother, and is almost three years older than his on-screen dad, Crispin Glover.

The device originally considered for use as the time travel machine was a refrigerator. Director Robert Zemeckis said in an interview that the idea was scrapped because he and Steven Spielberg did not want children to start climbing into refrigerators and getting trapped inside.

According to the Universal Studios back lot tour, the clock tower is the same one that is seen in the movie To Kill a Mockingbird (1962). The area is referred to as Mockingbird Square, and it is a stone's throw away from other famous filming locations, such as the exterior of the Psycho (1960) house and the "Red Sea".

Universal Pictures head Sid Sheinberg did not like the title "Back to the Future", insisting that nobody would see a movie with "future" in the title. In a memo to Robert Zemeckis, he said that the title should be changed to "Spaceman From Pluto", tying in with the Marty-as-alien jokes in the film, and also suggested further changes like replacing the "I'm Darth Vader from planet Vulcan" line with "I am a spaceman from Pluto!" Sid Sheinberg was persuaded to change his mind by a response memo from Steven Spielberg, which thanked him for sending a wonderful "joke memo", and that everyone got a kick out of it. Sid Sheinberg, too proud to admit he was serious, gave in to letting the film retain its title.

There are only about 32 special effects shots in the entire film.

John Lithgow and Jeff Goldblum were considered for the role of Doc Brown.

The lion statues in front of the Lyon Estates subdivisions were inspired by two like statues in the University City Loop in St. Louis, where writer Bob Gale grew up.