Trivia: When Hagrid is welcomed back to Hogwarts and everyone stands up and applauds, Vincent Crabbe also stands up and starts to applaud as well. This wasn't in the script and Tom Felton, staying in character, quickly grabbed Jamie and pulled him back down.
Trivia: John Rhys-Davies is missing the end of his middle finger on his left hand due to a farming accident as a child. The make-up artists made artificial, gelatin fingertips for him to wear in the movies. Davies one day, cut the tip in half, put 'blood' in it and closed it up. He went over to Peter Jackson (unaware of the gelatin tip) and said, "Boss, I've had an accident, look what happened". Jackson saw a small cut, but Davies bent the tip back and it split open, gushing.
Trivia: The first scene in which Obi-Wan and Anakin appear was filmed after principal photography had finished. Ewan McGregor had shaven off his beard, so he had to wear a fake one.
Trivia: When the real Santa and the fake Santa are fighting on the sleigh when the fake Santa is heading out to deliver coal to all the children, the fake Santa says something like 'You are a strange little man.' Buzz Lightyear (voiced by Tim Allen) in the movie Toy Story said the same thing to Woody.
Trivia: The voice of Scrappy was done by Scott Innes, who voices Scooby-Doo and others in the recent cartoons (since 1998).
Trivia: Adam Sandler is also the executive producer of the film.
Trivia: The outside of the arena where the Knights play is the Staples Center, but the inside of the arena is the Great Western Forum, two places where the Los Angeles NBA team Plays.
Trivia: When the movie shows that Joe is selling his house, there's a real estate sign. Notice carefully it says, "Curtiss Real Estate", this is named after the person at the credits "In Loving Memory of Katherine Ann Curtiss." (01:38:40)
Trivia: The date for the newspaper Professor Utonium and Hobo Jojo read is Wednesday, July 3, 2002. That's the day the movie was released into theaters.
Trivia: Did anyone else pick up the Indiana Jones and the Temple of Doom rip-off/reference? When Mathyus is in the harem of Lord Memnon and the archers come in, he cuts the gong off the wall and runs behind it as a shield, while the guards shoot at it in vain. He then busts out the window and jumps out of it.
Trivia: This trivia happens in the scene where the Littles hire the plumber to find the ring. Nearly everybody would know that the plumber is the same actor who plays Robert in "Everybody loves Raymond" series. Well, notice his name tag: "ROB".
Trivia: In the fight scene between Christian and Matthew, Christian really was head-butted and apparently had a lump the size of an egg on his forehead for some time afterwards - notice how his hair is more down over his forehead in some scenes than others to hide the lump.