Other mistake: The subtitle when Shu Mai is talking: "What are you proposing could be construed as treason" should read "What you are proposing could be construed as treason"
Other mistake: When Obi-Wan goes to the water planet and talks to the Prime Minister in his office. The alien is of course computer generated. When the actors do their blue screen work, markers are put up for them to look at so that when the finished shot is done, and the alien is put in, it looks like they're looking at the alien. In this scene, Obi-Wan is clearly not looking at the alien. (On one of the "making of" trailers at starwars.com you can hear George Lucas jokingly say "Eye-lines! I don't care about no stinking eye-lines," and the scene behind him is Obi-Wan talking to the alien...)
Audio problem: When the droid army is marching into the arena we see a close up of C-3PO and hear the sound of a marching army but the droids are walking on sand, so the sound should be muffled in some way.
Revealing mistake: When Anakin and Dooku are crossing the hangar shortly after Anakin's green lightsaber was destroyed. Anakin slices a thick cable on the ground causing the lights to flicker. Even at normal speed, it is blatantly obvious he never actually hits the cable, and furthermore the pyrotechnic effect is slightly out of synch with Anakin's motion.
Continuity mistake: When Padmé is getting in the last gunship Ki-Adi-Mundi's lightsaber changes from blue to green.
Suggested correction: His lightsaber is always blue, although he does help Kit Fisto board the gunship. For a moment, it could look like Kit Fisto's green lightsaber blade is coming from Ki Adi Mundi's hand.
