Character mistake: At the football players funeral, the guy on the left is still breathing, despite being dead.
Character mistake: Buster and June are watching TV, and he says, "Hey, Julie" (the actress' real name). (00:08:07)
Character mistake: When Frank proposes to a hypnotised Jane at the ball game, he says he bought the engagement ring 'this morning.' That morning they were still broken up, with Frank suspecting Jane of setting him up to be shot. They didn't reconcile until immediately before the game.
Character mistake: Mac's cousin says that even if Nick wasn't a cop, he'd have to hate Mac's guts. He says that Mac wears a Rolex and Nick wears a Timex - not true. Nick is wearing a Rolex, also.
Character mistake: Mr. Phillips told Michael (Danny) that he'd like him to apply for "early admission" to Julliard. Michael was a 17-year-old high school senior and had not yet auditioned for Julliard - the audition is to occur when a student his age is "entering 12th grade in the Fall of the academic year for which he is applying." It was too late to submit an application and an "early admission" was not possible at this point. (01:08:42)