I've been thinking some about the difference between the "Fredo" we see in the movie, and "Freddie" as he's mostly called in the novel. Fortunately both versions contain the "Don't ever takes sides against the Family again," line, so with either interpretation of the character you can still go on to GF2. I'm wondering, though, who could play the tough-but-dull Freddie of the novel. I actually think Danny Aiello would be very good, except that he was in his late thirties at the time the first movie was made.