There's another reference to the GF films in a Seinfeld in which I think George is trying desperately to figure out a way out of his engagement to Susan. He quotes the line from GF III of "Just when I think I'm out....they pull me back in!!" and he does the hand gestures that Pacino did with that line.

I was also told of another simpsons in which someone tells someone else that Homer sleeps with the fishes. That person said "Homer's dead?!?" and the guy replied "No, he just sleeps with the fishes, that's all." That one is second hand, so I may be remembering it wrong.