In the airplane scene, Carter orders gefilte fish - a reference to a similar scene in Rush Hour 2 (2001) that never made the final cut, because of Chris Tucker's inability to pronounce the name of the dish at the time.
Jackie Chan had a cracked sternum and bruises to his shins from his stunts. Watch the credits, for an outtake where Jackie throws a table backwards with his legs into himself, accidentally, at Genevieve's suite.
Roman Polanski was a fan of the first two Rush Hour movies. When it was learned that this film is set in Paris, he asked the producers and Brett Ratner whether they can give him a small role to appear. They happily complied with his wish.
Roman Polanski (as the Paris commissioner) was uncredited in the film's cast because of the continuing controversy of his in absentia conviction for child molestation. He has been listed on mainland European copies of the movie, but nothing in America, Canada or England.
Actor Kevin Dillon was cast in a small role in Rush Hour 3 (2007). Filming for his show Entourage (2004) prevented Dillon from accepting the role, but it was turned into a storyline for Dillon's character Johnny Drama on Entourage (2004).
Steven Seagal was one of the first actors considered to play a villain. However, the screenplay underwent multiple rewrites that ultimately led to casting Hiroyuki Sanada as the film's main antagonist.
In the scene when Lee and Carter first get in George's taxi, during the conversation, George says to Carter, "You guys can't even beat the Europeans in basketball anymore." He was referring to when Greece beat USA in the 2006 FIBA World Cup.
This is Roman Polanski's first role in an American film in fifteen years (since Back in the U.S.S.R. (1992), an American-Japanese production in 1992), and only his second role in an American film in the past 33 years (since Chinatown (1974)).
During the Dojo Scene in which Carter and Lee fight the giant, there is a picture in the middle of the shrine behind Master Yu. The picture is that of Chinese martial artist Huo Yuanjia, a Wushu master, and Chinese legend.