Back To The Future Fans Will Appreciate This Interview
When they first started filming the movie, Eric Stoltz was cast in the role that would ultimately go to Michael J. Fox. Many scenes were filmed with Eric before he was fired and replaced with Michael, which required a lot of re-shooting of now famous scenes to include Michael. In this interview, Christopher Lloyd (Doc Brown) and Tom Wilson (Biff Tannen) talk about their fears that they would also be fired.
This video shows a comparison of scenes filmed first with Eric Stoltz, then with Michael J. Fox.