I liked all the cameos and callbacks to previous movies/shows:

Instrumental version of pretend you don't see her
Van Zandt playing the singer
Actor who played Michael Spilotro in Casino was the owner of the Jewelry store where they were chastising his son
Lois the babysitter from Goodfellas as Jo Hoffa
Vinny Vella as the meat yard manager
Crazy Mario from Bronx Tale playing David Ferrie (whom Pesci played in JFK)