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4. John Cusack and Johnny Depp originally auditioned for the role of Marty McFly, but C. Thomas Howell was the finalist for the role, ultimately losing out to Eric Stoltz.
5. Five weeks into filming, the filmmakers realized Stoltz wasn't the right fit for the role, with Gale explaining to The Guardian, "The humor just hadn't been coming through with Eric. The studio weren't happy exactly, but they'd seen the footage so they bit the bullet."
6. Director Robert Zemeckis was the one to deliver the news to Stoltz, with the filmmaker recalling in the book Blockbuster that it was "the hardest meeting I've ever had in my life and it was all my fault. I broke his heart."
7. Reshooting all of the scenes Stoltz had already filmed added a reported $4 million to the movie's budget.