I've been obsessed with this for years and today I decided to dig up the YouTube Clips to back it up.
This scene from Annie Hall where Woody Allen's character comments that he is "standing with the cast of The Godfather" referring to the goons that had been harassing him for an autograph when he is talking to Diane Keaton who was in fact part of the cast of The Godfather.
And this scene from Looking for Mr. Goodbar where Diane Keaton is reading The Godfather at a bar and Richard Gere tells her that he saw the movie.
Just Sayin'!
Whats with the weird inter-textuality of Diane Keaton?