The entire sequence when Paulie is killed, from Clemenza's house to Paulie's death in sight of the Statue of Liberty.
The great camera work in the scene when Michael makes his case to be the one to kill the Turk and McCluskey. How the camera pans in on him sitting in the chair. And it is a great scene as well, it sets up the entire story to come.
The flashback scenes are all good.