Trivia: In the Fairy Godmother's workshop when Shrek dumps the cauldron of potion over the employees, two of them are transformed into Lumierre and Cogsworth from "Beauty and the Beast" (1991).
Trivia: The two old men near the end, talking about it being "old school" are voiced by Frank Thomas and Ollie Johnston, two Walt Disney animators who worked on such classics as Bambi and Cinderella.
Trivia: When Patience goes back to visit the cat lady Ophelia again, after she falls off the balcony and Ophelia throws pictures of catwomen in history down at her, you can see one of the pictures on the floor is Michelle Pfeiffer's Catwoman from "Batman Returns" (1992). (00:49:45)
Trivia: In Carlotta's dressing room there is a large portrait of Carlotta holding Andrew Lloyd Webber's head on a plate.
Trivia: At the ranger's office when the security guard was stealing the medical supplies, you see a cameo of M. Night Shamalayan in the reflection of the glass.
Trivia: When Mort smashes the shower door, the hole left in the glass looks like a small, four-legged animal with a screwdriver in its neck - which is how Shooter kills his dog.
Trivia: The bloated woman who is brought into the mall in the truck is actually played by a man. His name is Ermes Blarasin, and he is a stuntman.
Trivia: There is a party at J.D.'s school after the academic decathlon. Most of the students are wearing name tags. Sam's name tag says "Hello my name is Yoda." (00:21:50)
Trivia: Spider-Man creator Stan Lee makes his standard cameo appearance for this film when Spider-Man and Doc Ock are fighting on the side of the building. The first shot of the street during the fight shows a woman being pushed out of the way as some debris falls; the man pushing her is Lee.
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: 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: The man that punches Phileas when he attempts to beg for money is the director Frank Coraci. (01:22:20)
Trivia: Brick kills a rival reporter by throwing a trident in a scene lifted from the first gladiator fight in Spartacus (1960).