Trivia: The easter egg roll scene was filmed on Mount Vernon, with the White House added in the background.
Trivia: In the scene when the siblings are checking their father out of hospital, all of the announcements coming over the PA system are sampled from the start of the Queensryche song 'Eyes of a Stranger'.
Trivia: This movie is loosely based on Snow White and the Seven Dwarfs. There's the poison apple (fried computer), the seven male roommates and one female, and the kiss in the library to wake up Sydney.
Trivia: The girl who plays 'Lily at the stereo' is Rowan Atkinson's daughter, Lily.
Trivia: The magazine read by the guys at the end of the film annoucing the Cock awards, is actually Nuts magazine, a UK mens weekly magazine with a fake cover on it, in some shots you can see the "Pub Ammo" feature that appears at the back of every issue.
Trivia: Banks and Reuben mention being the few alive on the strip that actually shook Frank Sinatra's hand. Frank Sinatra played Danny Ocean in the original Ocean's 11.
Trivia: After Queen Lilly is dazed after banging the rocks with head to get them out of prison, she hums the first few bars of "A spoon full of Sugar." After Fiona asks if she's alright, she hums a few lines from "My favorite things," both songs made famous by Lilly's voice, Julie Andrews.
Trivia: The actress who plays Debbie is Leslie Mann, and she is the real-life wife of writer/director Judd Apatow. And the two girls who play Debbie's daughters are their daughters in real life. This was done on Apatow's part to make the on-screen family seem more like a real family.
Trivia: Using estimated punctuation, contractions, and whether or not numbers are spelled out, the sky banner would have cost the brothers around $103,500. Stripping the criteria down to letters only, it still cost a whopping $79,000.
Trivia: Siblings Anonymous features three real brothers of celebrities: Frank Stallone, Roger Clinton, and Stephen Baldwin.
Trivia: In the scene where Adam Sandler and Kevin James ask each other questions in preparation for the trail, they ask each other when their birthdays are. The birth dates they state are the actors' real-life birthdays. Adam Sandler 9th September, Kevin James 26th April.
Trivia: The bust in the hall way of the school has a similarity to Alistar Sim, who played the Fritton sister (headmistress) and brother in the original films.
Trivia: Though he plays a pop-star musician, Hugh Grant has stated that he does not listen to music or own any CDs.
Trivia: Dianne Wiest (born 1948), who played Dan Burns' mother, Nora, is only fourteen years older than Steve Carell (born 1962).
Trivia: Ben Murphy's parents in this film are actually John Krasinski's real-life parents.
Trivia: The large guy who says the town should have rather kidnapped the blacksmith from "Army of Darkness", is played by Timothy Patrick Quill, who also played the blacksmith in question.
Trivia: Steve Burns (Otto Granberry) has a drawing of a blue Pawprint in a piece of paper on his desk as a reference to Blue's Clues, the TV show he starred in.