The Cameo: Robert De Niro as mob boss Victor Tellegio. (Not only is he uncredited, but the end titles have a position for someone working for "Mr. Tellegio.")
Dyeing for Your Art: Christian Bale, as usual. He put on 43 pounds to play the overweight Irving. He also shaved his head, so he'd have an authentic combover and affected a slouchy posture throughout, herniating two discs in the process.