* Sollazzo needs $2 million in the novel, and $1 million in the movie.

* In the novel, Sonny first suspects that Clemenza sold out the Don along with Paulie. In the film, there appears to be no question of Clemenza's loyalty.

* In the film, Michael just magically returns from Sicily. I like the explanation in the book of the death row guy admitting to the Bronx killings. Hence, clearing Michael's name.

* In the film, Kay goes to Vegas after the baptism and Michael was supposed to go to. In the novel, Michael and Kay never planned to go to Vegas.