Trivia: When Roy is talking about his ideal life with Lynn, he mentions his three children, "Vera, Chuck and Dave," a very slick reference to the Beatles song "When I'm 64."
Trivia: In the final minutes of the film, Jackie Chan & Owen Wilson slide down the British flag that is draped over Big Ben clock tower. This is the same stunt performed by Pierce Brosnan & Michelle Yeoh in the James Bond film "Tomorrow Never Dies". The only difference is that in TND, they slide down a banner of the main villain's face. One possible explanation is that Jackie & Michelle have been known to compete with each other for the most daring stunts.
Trivia: Within 15 minutes of each other, this movie has thinly veiled references to Indiana Jones movies. The secret fireplace statue deal is right from Temple of Doom, the spinning fireplace fight deal is from Last Crusade (but may be derivative of earlier movies) and the torch flame exposing an exit is also out of an Indiana movie.
Trivia: The writers Alfred Gough and Miles Millar attracted some criticism over the film's many anachronisms. The duo later confirmed that, due to the somewhat whimsical and comedic nature of the film, they purposely chose not to follow history perfectly, and instead allowed themselves some wiggle room to include people, places and things that were from roughly the same time period (generally within 10-20 years), whether nor not they existed at the exact year the film took place.