The first scene in which Obi-Wan and Anakin appear was filmed after principal photography had finished. Ewan McGregor had shaven off his beard, so he had to wear a fake one. Submitted by Cubs FanDirected by George Lucas, starring Anthony Daniels, Christopher Lee, Ewan McGregor, Frank Oz, Hayden Christensen, Ian McDiarmid, Kenny Baker, Natalie Portman, Samuel L. Jackson, Temuera Morrison
The first scene in which Obi-Wan and Anakin appear was filmed after principal photography had finished. Ewan McGregor had shaven off his beard, so he had to wear a fake one. Submitted by Cubs Fan
According to the DVD commentary, Anakin's shadow on Tatooine (before he leaves the Lars' to find Shmi) was not digitally altered to resemble Darth Vader's helmet. It was pure coincidence. Submitted by Cubs Fan
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. Submitted by Matty Blast
When Zam Wessel is killed by Jango Fett, her last words are in Huttese. What she says translates to "Bounty hunter slimeball." Submitted by Cubs Fan
Amidala seem to buy her suitcases on earth. I've owned the same kind of suitcase set used in the flick. They're from a company called "Atlantic". The only way they've been modified for the film is the funky padding inside. [If I remember right, it's this case she's using].
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. Submitted by Xofer
In the floating pear scene, we see what type of cutlery they used a long time ago in a galaxy far, far away. It turns out to have been designed by the great Danish designer Arne Jacobsen, who is famous for his egg-shaped chair. But there may be a reason that Lucas used this cutlery - aside from looking futuristic, it is also the cutlery they use in 2001: A Space Odyssey.
One of the droids in the arena battle has 1138 written on his back. Submitted by Dr Wilson
The reason there are four pillars at the Genosian arena is that Lucas was thinking of having R4 tied up as well. He later changed his mind. Submitted by Matty Blast
One of the Aurebesh inscriptions is on the Dex's Diner droid waitress. She has a label on her chest saying 'Flo'. Submitted by Dr Wilson
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.
In the scene where Obi-Wan is getting the tour of the cloning facility he looks up to the ceiling and the camera shot switches to show some equipment moving. It seems like a senseless shot that dosen't fit with the rest of the scene. If you look closely you will notice that the piece of equipment is actually the saucer section of a Star Trek starship, possibly Voyager or the Enterprise -E.