Time circuits on.
  1. The script was rejected over 40 times by every major studio.
    "Some more than once," co-creator Bob Gale told CNN.
  2. Disney execs thought it was too dirty.
    "You've got the kid and the mother in his car!" they told Gale and director Robert Zemeckis. "It's incest!"
  3. Worried that people would shun a film with 'future' in its name, a studio exec tried to change Back to the Future to Spaceman From Pluto.
    Executive Producer Steven Spielberg sent back a thank you note for the 'humorous memo.'
  4. At no point in any of the Back to the Future movies did anyone predict the Florida Marlins would win the 1997 World Series.
    Or the 2003 World Series. I don't care what that email forward says.
  5. But the Internet will melt if the Cubs somehow rebound to win the 2015 World Series.
  6. In 2011, Bob Gale told mental_floss the origin of Marty and Doc's friendship.
    "He snuck into Doc’s lab, and was fascinated by all the cool stuff that was there. When Doc found him there, he was delighted to find that Marty thought he was cool and accepted him for what he was. Both of them were the black sheep in their respective environments. Doc gave Marty a part-time job to help with experiments, tend to the lab, tend to the dog, etc."
  7. When Slate wrote a story questioning whether Bob Gale was actually behind the explanation, he sent us this:
  8. In the early drafts of Back to the Future, the time machine was made out of an old refrigerator...
    ...and Doc Brown had a pet chimpanzee.
  9. In an early draft of Back to the Future II, Marty travels to 1967, where he's arrested for not having a draft card.
  10. The Back to the Future II promotional sunglasses sold at Pizza Hut are available on eBay.
  11. Ronald Reagan was offered the role of Hill Valley's mayor in Back to the Future III.
    While that didn't work out, Reagan did quote the film in his 1986 State of the Union: "Where we're going, we don't need roads."
  12. As you probably noticed when you were eight years old, the Twin Pines Mall becomes the Lone Pine Mall.
  13. In the window of the Cafe 80s, Marty sees several Nintendo games...
  14. ...a Roger Rabbit doll...
  15. iron, and a Dustbuster.
  16. Elijah Wood made his film debut in Back to the Future II as the kid playing the arcade game Wild Gunman in the Cafe 80s.
  17. John DeLorean wrote Bob Gale a letter, thanking him for "keeping my dream alive."
  18. The school that served as Hill Valley High School in Back to the Future was Whittier High—Richard Nixon's alma mater.
  19. In Back to the Future II, an old newspaper in the alternate 1985 reads, “Nixon to Seek Fifth Term; Vows End to Vietnam War by 1985.”
  20. The whole Hill Valley Telegraph is worth another look.
    As Jonathan Chiat noted in an excellent round-up of the paper's front pages for New York Magazine, "It is unclear why the Telegraph’s editors would devote such extensive space to Biff Tannen gambling coverage."