I feel that both Al and Rocco didnt get enough character development, especially Neri, in the book he is given an entire chapter on how Michael saves him and makes him his enforcer his 'luca brasi' in the movie he just 'appears' FFC should have really at least filmed some scenes showing how he came to be there

Sonny - Well then, business will have to suffer, all right? And listen, do me a favor, Tom. No more advice on how to patch things up, just help me win, please