Revealing mistake: When the sniper is shooting the cans, the close-up of the first can shows the metal peeling out as though the bullet had come from inside instead of outside.
The Jerk (1979)
Directed by: Carl Reiner
Starring: Steve Martin, Bernadette Peters, Mabel King, Catlin Adams
Visible crew/equipment: Carnival biker chick goes through a flaming hoop and falls down after going though it. Just before she goes, you can see a rope tied to her to pull her off the bike after she passes through the flames. (00:33:30)
Revealing mistake: When Bernadette Peters throws a knife at Steve Martin, it never leaves her hand. (01:18:05)
Trivia: The Cat Juggler, in the film, was Steve Martin. (01:12:40 - 01:13:30)
Trivia: "Cat Juggling" was a bit in Steve Martin's stand-up acts in the late 70's.
Trivia: Director Rob Reiner has a cameo as the truck driver who takes Navin to the end of the fence.
Mother: Navin, it's your birthday, and it's time you knew. You're not our natural-born child.
Navin R. Johnson: I'm not? You mean I'm gonna stay this color?
Taj Jonson: Hey! Any of you bums heard of Navin R. Johnson?
Navin R. Johnson: I've heard of him.
Taj Jonson: Born in Mississippi? Inventor of the Opti-grab?
Navin R. Johnson: I was just telling these guys.
Mother: Navin.
Navin R. Johnson: Mommy, Daddy! How did you find me?
Father: We don't know. This is the first place we looked.
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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).