I always thought it was a pun of the film . . .
How do you pun a film???? A Pun is a form of usage of words. A film is not a word...What??
Er, maybe you meant "a pun on the name of the film". Or maybe you meant a pun of the phrase "the film"? But Terms and/of Endearment is nowhere near a pun of that. Oh dear, now I'm confused too.
What has a film to do with it anyway??
It's blindingly obvious it's a (barely humourous) play on words as Canada Goose said; well, what else could it be?
Doh!