If a teacher of English wanted to teach malapropisms to his students, he'd simply tell his charges to listen to every word that Mae and W.C. say in this movie!
Stupid!?! I never called you stupid! To call you stupid would be an insult to stupid people!
I respectfully request that you please supply specific examples of what you consider their malapropisms as I believe you are actually referring to double entendres.
One definition of a malapropism is "the unintentional misuse of a word by confusion with one of similar sound, esp when creating a ridiculous effect"
I really don't see either of them having done this....instead they use arcane words and phrases applied in unique ways, often with underlying or multiple meanings.
Not trying to be an word-nazi but I find it most ironic considering your mention of English teachers, particularly when it comes to two of the most loquacious comedian/actors in history.
One definition of a malapropism is "the unintentional misuse of a word by confusion with one of similar sound, esp when creating a ridiculous effect"
I learned MUCH of what I know about English, and humor, from
William Claude Dukenfield. I could not have had a better teacher.