Trivia: In one of the trivia books about the movie, there is a page where the different beverages sold at Dex's Diner are illustrated. One of the substances is labelled 'Alludium PU-36.' Alludium PU-36 is the 'explosive space modulator' that Marvin the Martian attempted to use to blow up the earth in the Warner Brothers Bugs Bunny cartoon.
Trivia: After the fight scene between Obi-Wan and Jango Fett at Kamino, as Jango runs up the walkway into his ship, the door closes from above and knocks Jango in the head as he enters. Deliberately done - a little nod to the Storm trooper in Star Wars. While there's no proof (yet) that all storm troopers are clones (films are the only canon, remember), this seems to suggest that a few years down the line at least some are, and have inherited their "father's" occasional clumsiness. Confirmed in the commentary.
Trivia: The vehicle that Anakin steals for the Coruscant chase scene has deer whistles on it, right behind Anakin and Obi-Wan's heads. For those that don't know what deer whistles are, they are small whistles that mount on the bumper of your car and make a high-pitched noise (too high for human ears but perfect for animals) to scare deer off the highways.
Trivia: The tower where Dooku meets Sidious at the end of the movie is obviously incomplete (unfinished parts can be seen). It also looks very much like the Emperor's Citadel, briefly seen in the cutscenes of the Tie Fighter computer game (then, completed).
Trivia: Jett Lucas (the son of George Lucas) appears as a young jedi padawan, and Katie Lucas (George's daughter) appears as a twilek in the Coruscant bar.