Macalou

Answer: Due to his scheduling on Family Ties, Michael J. Fox was not originally available, so they went with their second choice of Eric Stoltz. The studio, however, permitted Fox to film the movie only if it didn't interfere with his obligations to them. So, he filmed Back to the Future at night and on days he wasn't needed at the Family Ties set.

Macalou

Chosen answer: It only took me a couple of seconds to find a fan site with a credible answer. Apparently, in an early draft, Marty mentions in passing that Doc hired him to clean out his garage for fifty bucks and total access to his record collection. This scene was presumably never shot, thus the backstory was lost to time. See www.kristensheley.com/bttf/bttfuniverse.html for more extensive info.

Macalou

Question: At the beginning of the movie, the brother is a loser who works at Burger King. At the end, he wears a suit and work at an office. As a presumably successful business man, wouldn't he have moved out of his parents' house?

Answer: Who says he didn't? Perhaps he lives close enough to come over for breakfast each morning. There isn't enough information in the scene to show that he still lives there; he is simply sitting at the table.

Macalou

Answer: I think that both of Marty's siblings live at the house. This theory comes from Dave remarking that somebody named Greg or Craig called for his sister. If he had his own house, he wouldn't have got that call, and it wouldn't go to George and Lorraine's house either.

Answer: Even though the brother now has a steady career and would normally have his own place, this is a movie-plot device using a "suspension of disbelief." The audience needs to be able to see Marty's reaction and surprise as to how every McFly family member has changed for the better. We just accept the premise.

raywest

Answer: If we presume he's living at home, wearing a suit to an office job doesn't really reflect on his success or wealth, and he's still just 21 or 22 years old. He may still be in college and just working on the weekend and living at home to save money.

Bishop73

Is there a source for his age? I always wondered if he wasn't closer to being around 28.

In the novelization of the film, he is said to be 21. In a first draft version of part 2, where Marty travels to 1967, Dave is 5 years old.

Bishop73

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