Factual error: Marie plays a horn solo on the beach. At times continuous sound is coming out of the horn while she is inhaling through her mouth. Horns only produce sound when the player exhales.
The Jerk (1979)
1 factual error - chronological order
Directed by: Carl Reiner
Starring: Steve Martin, Bernadette Peters, Mabel King, Catlin Adams
Revealing mistake: When Bernadette Peters throws a knife at Steve Martin, it never leaves her hand. (01:18:05)
More quotes from The Jerk
Trivia: "Cat Juggling" was a bit in Steve Martin's stand-up acts in the late 70's.
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Answer: Navin self-applies the "Jerk" epithet early in the film, using it not in the sense of someone obnoxious or mean (as it is used in most cases), but in the sense of a stupid person. He's saying he blames himself and his lack of intelligence (though, as you say, it is usually simple naïveté) for ending up where he is (broke, homeless).