Trivia: The first alien in the mail room that Will Smith starts to talk to in alien language is a rapper known in real life as Biz Markie. He is really making those noises with his mouth. (00:28:35)
Trivia: The main drummer for Morris Brown at the end of the movie during the tie breaker is the actual drummer used for close up shots of Devin's hands when he has to drum.
Trivia: The man who plays Ian's friend Mike is played by Ian Gomez, who is Nia Vardalos' husband in real life.
Trivia: The content of the email received by Austin while he is demonstrating the internet is 'A new ATM card will be sent to you by Fed-Ex because your account has ben compromised by an unknown hacker who obtained your PIN Number while you were purchasing an MP3 Player on E-Bay. Sincerely, Your Bank.' This was included because Mike Myers really did have his bank account compromised shortly before filming. (00:38:37)
Trivia: If you've seen the part of "Four Rooms" called "The Misbehavers" you will notice in Spy Kids II, Antonio Banderas is combing Juni's hair and it's almost the same scene as when he combs his son's hair in Four Rooms. (same director)
Trivia: Steve Oedekerk did all the dubbed voices except for Woah.
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: It's said that Van has been in college for 7 years. This is a nod to a line from John Belushi in "Animal House," when he says, "Seven years of my life for nothing."
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: In the scene where Warren Schmidt falls asleep in the bath, his posture is exactly like Marat in the painting 'Death of Marat', by J.L. David. You can take a look at the original at http://www.artchive.com/artchive/D/david/marat.jpg.html.
Trivia: In the scene right after Eddie Murphy gets in a fight with Owen Wilson and Eddie gets arrested, Owen is walking in an industrial area. While he is walking a "stray" dog runs behind him. I personally know that this dog belongs to the director.
Trivia: Dizzy/Gil (Qualls) is taken to the new school by the police in the van. This scene is identical to the scene in Con-Air when Garland (Steve Buscemi) is taken to the plane.
Trivia: When the main agent verifies his hand against the screen, one of the pieces of information listed is 'Sector 7G'. This is where Homer Simpson works at the Springfield Nuclear Power Plant.
Trivia: In the movie Barry buys lots of Healthy Choice pudding to get the frequent flier miles. In real life Healthy Choice had this actual promotion and there was a news story about a man who bought a lot of the pudding and got enough free miles to fly his family on quite a few trips to other countries.
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: In the trailers (on the radio in the UK, anyway), there's a bit with Hugh Grant saying something like "This is no job for a grown up - drinking without being responsible...actually, it doesn't sound that bad". This was never in the finished film.