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After Marty shows up at a party dressed as a clown, a boy's father says, "Show him the nutcracker," and the boy then runs at Marty and apparently kicks him in the crotch (but we don't see the direct impact).
At least 3 hells, 1 crap, 5 uses of "Oh my God" and 1 use of "Oh sweet God" as exclamations. 1 use of "Up yours" and "Eat my boobies."
Marty asks Jason if he smokes cigars (he says he doesn't as he's only 14) and then lights one up for himself.
Although it's played for laughs and most everyone will recognize that it's just another part of the kids' ploy, a scene where an alarm goes off in a helicopter and Vince tells Marty that they must jump out with just one parachute might be a tiny bit suspenseful to some younger kids (but everyone is okay).