i suggest you read it escobar. it has lot of details on the characters(Al Neri, Luca etc) and learn about the other characters that are not included in the movie . . .
Sure does, it also makes reference to several characters that we see in the movies but dont get to know very well, in the book there characteristics and pasts are mentioned.
i wish they had added that scene where the bocchiocio who takes the rap for the killing of Mc'Cluskey and Sollozzo kills his friend that gave him wrong advice on a business affair and then just sits at a luncheonette and waits for the police to arrive to arrest him. Maybe in a deleted scene they could have explained how Micheal was arranged to be brought back "cleared of the false charges" through that man's taking the rap.