Edward Norton later stated in interviews that he did this movie solely to have his name on the same poster with Robert De Niro and Marlon Brando.
Marlon Brando refused to smile in his last scene in this movie, so his ever-so-slight smile was added digitally in post-production.
Marlon Brando took to calling director Frank Oz "Fozzie" and "Miss Piggy" during this movie. Oz has been the voice of Fozzie Bear and Miss Piggy in the various Muppet productions since the beginning. Brando's hazing of Oz over his work with the Muppets got so bad that Robert De Niro was forced to direct Brando instead, with Oz giving him instructions via headset.
This is the only movie to star Robert De Niro and Marlon Brando, the first actors to win Academy Awards for playing the same role, that of Vito Corleone in the Il padrino (1972) and Il padrino - Parte II (1974).