One use of the f-word around the half way mark film, said by Dark Helmet and and not easy to miss, That might have been the reason why it wasn't given the PG-13 rating due to the word being said very quickly/ (The PG-13 rating existed at this time.)
Someone gets called a "shithead."
1 use of "fuck", 7 uses of "shit", 1 use of "son of a bitch", 1 use of "bitch", 2 uses of "ass", 7 uses of "asshole", 11 uses of "hell", 4 use of "damn". Pretty strong for a PG rating.
A scene full of "assholes" Context: There were actually CHARACTERS named Assholes, for comedic reasons, not actual assholes.
Lots of strong language for a PG rated movie.
Comedic swearing.
Keep in mind this a 1980s PG, so the language may be a bit edgy. And includes PG-13 territory language for example being the f-bomb that is only said very quickly which MPA employees might have missed and that could be the reason for the PG rating.
There are several crew members aboard the Spaceball I named Asshole.
Barf gives a middle finger to two guards.
An extended gag, where many of the bridge crew on Spaceball One share the surname "Asshole" and it is repeated throughout the sequence. Since it is some characters' surname the word "Asshole" is listed in the end credits.
Instances of "shit", "damn", "bullshit" and other profanities pepper this movie.
One use of the word "fuck" in a non-sexual content in the escape pod scene.