Mozart also invented a system that used dice to randomly generate music. My unverifiable theory is that he continued refining the system and it got so good that he used it to compose all his greatest hits and stopped telling anybody about his random music generator.

Mozart was also a completely ungovernable furry with ADHD. He was a child genius, but that meant he was sitting in opera rehearsals as a bored teenager.

And when he’d get bored, he’d start finding ways to entertain himself. This included doing things like playing “the floor is lava” while using the orchestra members as platforms, and prancing around while loudly meowing.

And all of them basically put up with it, the same way that modern tour managers put up with annoying frontmen in popular bands.

Mozart had a sister who was also a genius composer, but was forced to quit her training to be more "marriageable."

It's probably not this one: https://en.wikipedia.org/wiki/Leck_mir_den_Arsch_fein_recht_sch%C3%B6n_sauber

i am now mad that this wasn't included in the movie

Pet is french for fart, and Mozart had a fart fetish. It also rhymes.