[fr_freak]

Sure, you could make a movie about a fictional classical composer, but nobody would have heard of him, so who cares? Plus, if he’s fictional, you’ll have to hire a composer to make up some fake music for him to have written,...

That's a good point about the music, but Mozart's familiarity is part of the point. People go to the movie thinking "Hey, I've heard of Mozart, let me go see a movie about his life." But it isn't his life - it's a fictional story. People may know that in their heads when they watch it, but I guarantee that whenever they hear the name Mozart, they'll think of the events of the movie. It will influence how they see him forever.

[Boogieman]

Sure, but the people making the movie care more about making a successful movie than whether people know all the true facts about Mozart. They get paid to entertain, not to educate.