fortunately I've seen all these episodes you talked about. The Godfather is my favorite movie and these are my favorite TV shows, so I really love this kinda homage. I remember another one in "The Simpsons" - I don't remember exactly what is going on in the episode. I think is that one when Homer gets a certificate to represent Krusty The Clown in events, and when Fat Tony and the mob go after Krusty to make him pay what he owns to them, they end up getting Homer. well, later they get Krusty too and then an old Don with a funny moustache says that if he and Homer make a spin with a mini-bycicle they will be forgiven, and while trying to do that, they walk through a bar with a lot of bottles, and as they knock their heads in them, it sounds like the Godfather theme.

there's a lot of other references to The Godfather in many shows, I remember seeing it in My Wife and Kids for example