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Rob Dougan composed his part of the soundtrack, "Chateau", from his home in London without access to a video editing suite. To check whether the music synchronised with the temp version of the scene, he would start the track on his laptop, and hit "play" on his DVD player with his foot at the same time. Once the track was composed, the instrumental parts had to be recorded in LA by the movie's orchestra. Lacking any contacts in the city, but not wanting series composer Don Davis' style to dominate the piece, Dougan was eventually able to convince the directors to let an acquaintance of a friend orchestrate and conduct the performance.
The fight sequence of Neo versus Smith and his clones (a.k.a. The Burly Brawl) took 27 days to shoot.
GM donated 300 cars for use in the production of the movie. All 300 were wrecked by the end.
The Wachowskis' contract for doing The Matrix Reloaded (2003) and The Matrix Revolutions (2003) included a stipulation that they wouldn't have to do any media interviews.
Around 97 percent of the material from the film sets were recycled after filming. For example, tons of wood were sent to Mexico to build low-income housing.
The role of Seraph was written specifically for Jet Li. Reportedly, Jet Li asked for the same amount of money that Keanu Reeves was getting to do the film. The role was then changed to a female and offered to Michelle Yeoh, who turned it down due to scheduling conflicts.
Bill Pope: The director of photography makes an appearance as a security guard who gets paid to count sheep.