If you compared the McFly's situation at the start of the movie, they live in a crappy old house, with barely any money to scrape together, uncle's a perpetual jailbird, dad has a terrible job and is still being bullied by Biff 30 years later, and not surprisingly, Marty spends as little time at home as possible.
You look at their situation at the end of the movie, it's very different. They live in a nice house, both Marty and his sister have their own beautiful, shiny cars, the dad has published a successful novel, and everyone's happy. I think in some ways they were "rich," but not super rich. Not all rich people live large like the celebrities in Hollywood do. Some will maintain a middle-class lifestyle, but can live more comfortably than their neighbors and go on more vacations during the year.
The trouble with Crispin Glover is, he had a weak personality to start with, which was one reason he was so good at portraying George McFly as a shy, weak, cowardly doormat. It was his first big acting part, and he was just lucky that the movie was a huge success and made him and the rest of the cast big stars. The trouble is, George McFly was not a main character in the movie, and probably the most pitied, if not disliked, besides Biff. Glover experienced an ego explosion from all the money and fame he got, and his head got so big he had trouble fitting it through doorways, if you catch my drift. He became very difficult to work with behind the scenes in subsequent movies, demanding people bow and kiss his feet whenever he walked into a room. It's one reason he was not physically in the later BTTF sequels, and rarely is seen in movies today, because word got around Hollywood, and nobody wants to work with him. I'm amazed people could put up with him long enough for "Beowulf" and "Alice in Wonderland."
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