When John D'Leo first met Dianna Agron on-set, he unknowingly asked her if she was the Make-up Girl. Agron burst out laughing and said, "I'm your sister!"
The source novel's title, "Malavita," is the name of the family dog.
After beating up the plumber with a baseball bat, Robert De Niro's character quotes a line by Al Capone: "You can get further with a kind word and a gun, than you can with just a kind word." This same line is said by De Niro when he played Al Capone in The Untouchables (1987), in which he also beat an underling with a baseball bat.
When Don Luchese (Stan Carp) receives the bucket of ice in prison, he is reading the newspaper "La Repubblica". In the top right corner of the front page a picture of "LEON" can be seen, and next to it advertisement for "NIKITA". Both films made by Luc Besson: La Femme Nikita (1990) and Léon: The Professional (1994).
Giovanni (Robert De Niro) is invited to talk about the movie "Goodfellas" (1990) at a special screening. De Niro starred in that movie along with several supporting cast members in this movie.