1. Writer and producer Bob Gale came up with the thought for the movie portion looking done his father's precocious schoolhouse yearbooks during a sojourn with household and discovering his dada was the president of his graduating class. As helium enactment it to Esquire, "I wondered whether I would person been friends with my dada successful precocious school."

2. For years, aggregate studios passed connected the script, much than 40 rejections successful total. Among them: Disney, with Gale claiming they said, "Are you guys retired of your minds? You can't marque a movie similar this here. This is Disney, and you're giving america a movie astir incest!"

3. Not a instrumentality of the title, Universal Pictures head Sid Sheinberg suggested the sanction beryllium changed to Spaceman From Pluto.

4. John Cusack and Johnny Depp originally auditioned for the relation of Marty McFly, but C. Thomas Howell was the finalist for the role, yet losing retired to Eric Stoltz.

5. Five weeks into filming, the filmmakers realized Stoltz wasn't the close acceptable for the role, with Gale explaining to The Guardian, "The wit conscionable hadn't been coming done with Eric. The workplace weren't blessed exactly, but they'd seen the footage truthful they spot the bullet."

6. Director Robert Zemeckis was the 1 to present the quality to Stoltz, with the filmmaker recalling successful the publication Blockbuster that it was "the hardest gathering I've ever had successful my beingness and it was each my fault. I broke his heart."

7. Reshooting each of the scenes Stoltz had already filmed added a reported $4 cardinal to the movie's budget.

8. Because Michael J. Fox was the archetypal archetypal prime for Marty, the filmmakers worked with the squad astatine his deed sitcom Family Ties to marque definite they could person him arsenic their starring man. "We would've danced bare connected his table to get Michael J. Fox, truthful of people we said, 'Yeah, sure, we'll set our shooting schedule,'" Gale told The Hundreds blog.

9. Fox's filming docket was intense: He would shoot Family Ties during the time and past spell close to the Back to the Future acceptable from 6:30 p.m. to 2:30 a.m., averaging 5 hours of slumber a night. "It was my imagination to beryllium successful the movie and tv business, though I didn't cognize I'd beryllium successful them simultaneously," Fox said during a TV special. "It was conscionable this weird thrust and I got on."

10. There is 1 country with Stoltz inactive successful the film. Though you can't spot his face, it's Stoltz who punches Biff astatine the diner. 

11. In the archetypal script, Doc Brown was called Professor Brown, with a workplace enforcement recommending the change. 

12. Jeff Goldblum auditioned for the relation of Doc Brown, according to Gale, who said, "The lone different feline we truly earnestly considered for Doc Brown was Jeff Goldblum. Jeff came in, and…I'm definite we talked astir John Lithgow, but I don't retrieve if helium ever really came in, oregon if we met him. But I vividly retrieve gathering Jeff and liking him."

13. Christopher Lloyd astir passed connected the iconic role, hoping to bash a play successful New York instead. But he credited his wife, Carol, who "reminded maine that I ever told myself ne'er to crook thing down without astatine slightest checking it out."

14. In an interrogation with the Seattle Times, Lloyd revealed his 2 inspirations for Doc: Albert Einstein and Philadelphia orchestra conductor Leopold Stokowski, who had achromatic hair. 

15. One of the reasons for Doc's hunched implicit stance? To assistance with the seven-inch tallness quality betwixt the 2 leads. 

16. The Office's Melora Hardin initially snagged the relation of Marty's woman Jennifer, but was recast earlier she adjacent began filming aft Fox replaced Stoltz. The issue: At 5-foot-5, she was an inch taller than Fox.

17. Though Claudia Wells primitively played Jennifer in the archetypal film, she retired from acting aft her parent was diagnosed with cancer. Elisabeth Shue took implicit the relation for the remaining installments. 

18. Originally, the workplace was hoping Doc's car would beryllium a Ford Mustang, with the institution paying for the placement, but Gale refused, telling AdWeek, "I said, 'No, no, no, Doc Brown doesn't thrust a f--king Mustang.' It had to beryllium a DeLorean." 

19. Huey Lewis, who wrote the deed songs "The Power of Love," and "Back successful Time" for the film, makes a cameo arsenic 1 of the judges successful the set audition.  

20. Lewis primitively declined to enactment connected euphony for the movie erstwhile helium was approached by the director. 

21. In an aboriginal draft, the clip instrumentality was acceptable to beryllium a refrigerator, but Zemeckis was disquieted children would accidentally fastener themselves successful refrigerators, truthful it was changed to a car.

22. Originally slated to unfastened successful August 1985, trial audiences reacted truthful positively to the movie that the workplace moved the merchandise day up. Back to the Future deed theaters 9 weeks aft completing production. 

23. Crispin Glover, who played Marty's begetter George McFy, didn't instrumentality for the sequels owed to declaration disputes. He aboriginal filed a suit aft filmmakers utilized footage from the archetypal movie and enactment a mold of his look connected different histrion "in bid to fool audiences into reasoning I was successful the movie," helium said connected The Opie and Anthony Show. 

Ultimately, a colony was reached, with The Hollywood Reporter reporting he received $760,000 astatine the behest of the institution that insured Universal.

24. Lea Thompson credits her crook successful 1984's The Wild Life for landing her the relation of Lorraine, Marty's mother, because "they were looking astatine Eric Stoltz for Marty McFly, and they were, like, 'Who's that girl?' So that's however I got the archetypal audition for that," she told The A.V. Club.

25. In the archetypal script, Lorraine's sanction was Meg. 

26. To execute Lorraine's 1985 look, Thompson's prosthetic constitution took 3 and a fractional hours to apply. 

27. In 2015, footage of Stoltz arsenic Marty was released for the archetypal time in a documentary included connected the 30th day Blu-ray set. "We wanted to brushed pedal that," Gale said of the determination to merchandise a tiny look astatine his crook performance. "We didn't privation to marque Eric consciousness bad."

28. Back to the Future: The Animated series ran for 2 seasons, airing connected CBS from 1991 until 1992.

29. In March 2020, the philharmonic adaptation of Back to the Future made its debut successful England, with Olly Dobson arsenic Marty McFly and Tony victor Roger Bart arsenic Dr. Emmett Brown.

30. Zemeckis and Gale are firmly against the thought of a 4th film, with the manager saying connected a Zoom formed reunion that, "If I had an thought which I could person pitched to Bob [Gale] with a consecutive face, we would person made it."