I'm one of the many people who read the novel years after become a fan of the movie.

The thing I liked more about the novel:

1. We find out how they got Michael back from Sicily and the whole Bochicchio story.

2. The sub plot about Don Tomassino having problems in Palermo that were the result of Barzini's search for Michael.

3. Michael's revenge against Fabrizio. I could never understand how he let that one go.

4. I liked the Genco figure being brought into the 1940's even if only in the death scene. It tied things together from the grocery business, to the Olive Oil business, to his role as Consiglieri, just briefly alluded to by Sonny in the movie.

5. The Johnny Fontane character was interesting and his relationship with Nino. I liked the building of the whole Hollywood-Las Vegas connection.

6. It was also interesting to understand that the Corleone Family were major participants/owners in several Las Vegas casino businesses including Moe Green's hotel. It gave additional understanding to Michaels stand with Moe Green and the fact that the casino was losing money. Gambling was the backbone of the Corleone Family business.

7. I enjoyed knowing more about the business young Vito and Clemenza were involved in hijacking trucks from the garment district and selling dresses. It made me understand how Fannucci caught on to them and where he got the leverage to demand the money. He was charging them for protection, when in reality he would probably be the one to rat them out to the authorities if they didn't pay.