The trivia item below may give away important plot points.
When Jimmy Pockets (Bathazar Getty) picks up Marco, (Norman Reedus) they begin to discuss the fight that had just took place at which point Marco asks Jimmy, "where's Leon?" (Stephen Dorff) to which Jimmy replies, "ask father Aldo. He's gonna make him a saint". This is an obvious hint towards The film "The Boondock Saints" in which Norman Reedus plays a vigilante.