Continuity mistake: When Benny and Joon are riding in the car to Benny's friend's house, Joon looks up at Sam in the tree. This scene is in slow motion, and we can see Benny's hand turning the wheel sharply to the right to turn into the driveway. There is another shot of Sam in the tree, then the shot of Joon is recycled -- Benny's hand is again moving the steering wheel sharply to the right.
Benny (Aidan Quinn) is a mechanic who has been taking care of his mentally ill younger sister, Joon, since their parents died. This consumes his whole life, and gets in the way of a relationship he is pursuing with a pretty actress-turned-waitress, Ruthie (Julianne Moore). When Joon loses in a poker game, Benny is forced to take in his friend's eccentric cousin, Sam (Johnny Depp), a loner who loves movies, especially silent ones. Everything is going well, until Sam and Joon start a relationship, which Benny violently dissaproves of.
Joon: Don't underestimate the mentally ill. We know how to count.
Question: What exactly is wrong with Joon? I don't think they mentioned it in the movie, but does anyone have a good guess?
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