The two best scenes, IMO, are Connie's wedding (especially the opening with Bonasera and the Don); and the entire Havana sequence (especially Hyman Roth's soliloquey). The Dons' convention scene, the Senate hearing, Michael and Frankie in Frankie's study, and Michael and Appolonia's father, are right up there.

Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.