Trivia: In the scene where Alex approaches the two girls at the record stand you can see the original score for 2001: A Space Odyssey, also directed by Stanley Kubrick.
Trivia: Captain Vincent Peter Lombardi, skipper of the New York Riverways ferry Thomas Jefferson, plays himself in the film. (00:49:24 - 01:34:40)
Trivia: Christian Bale dropped approximately 60 pounds for the role, going from 180 to 120, by eating a diet of one can of tuna and an apple a day for months. This is the most weight ever lost by an actor for a film role. Within 6 months of this film he then put on 100 pounds to play Batman in Batman Begins. He actually gained so much weight he was too big for the batsuit and had to drop 20lb for filming.
Trivia: Director Martin Scorsese makes more then just a cameo in this film, he's the passenger that sits with Travis talking about how he's going to kill his wife for cheating on him with a black man. He's credited as "Man Watching Silhouette".
Trivia: When Crichton talks to "Harvey" (Scorpius in his head) for the first time in the movie, Scorpius is dressed like Einstein. There is a blackboard with equations on it. One of them is "e = MC hammer". (00:21:30)
Trivia: While Mr. Freeze is at Shaugnessy's, when Shaka smacks Dick across the room, he ends up flat on his back, and in the close-up when Dick raises his head, the buttons on his vest switch sides momentarily. Then the buttons revert back (noted in trivia because it's better when clicked through slowly). (00:24:25)
Trivia: The toddler who plays young Aurora is the daughter of Angelina Jolie and Brad Pitt, Vivienne Jolie-Pitt.
Trivia: Choke author Chuck Palahnuik can be glimpsed in the final scene sitting next to Sam Rockwell on the plane.
Trivia: In the scene of Missy's funeral, Stephen King plays the priest.
Trivia: S.E. Hinton, the author of "The Outsiders", has a cameo in the scene where Johnny is lying on his stomach in hospital, playing the nurse tending to Dally who says "what did you do with your gown?"
Trivia: In the last scene of the movie when Chris and his son are crossing the street and telling jokes, they pass a man in a suit who gives them a brief nod. This is a cameo appearance from the real Chris Gardner.
Trivia: The Ad Executive Mark and Eduardo are asking for advertising funding is portrayed by Aaron Sorkin, who wrote the screenplay of this movie. (01:05:00)
Trivia: During the Battle of Vulcan, as Sulu goes under a piece of another starship, you can see R2-D2 go flying past just over his shoulder. (00:47:35)
Trivia: Steven Spielberg has a cameo as one of the doctors when Elliot and E.T. are 'hospitalized' inside the house.
