Continuity mistake: The red-marked leader of the ARC Troopers sure goes through a rapid succession of field promotions and degradations. In Chapter III, he is addressed by Obi-Wan as a Sergeant; when Obi-Wan arrives at the Banking Clan's HQ in Chapter IX, he calls him Commander; and when Anakin returns from his duel with Asajj Ventress in Chapter XX, he is suddenly a Captain.
Continuity mistake: When Count Dooku and the disguised Asajj Ventress watch the fighters in the Rattatak arena, the lodge they sit in at first seems almost level with the arena floor. Later, when Dooku floats to the arena floor after Asajj has finished all enemies, the lodge is high above the ground.
Continuity mistake: As the ARC troopers' gunship breaks off from the rest of the ships and as it's flying through the city, its markings are blue. But as the ship is hit and crashing, its markings are the red. (It is definitely the same ship, as we see the ARC troopers emerge from it after the crash.). (00:05:55)
Continuity mistake: When the Sniper Droid zeroes in on an ARC Troopers head, we see them in a ring around the gunship, with 2 ARC Troopers on top of the wreckage, but in the shot after that we see them in a completely different position, with all the ARCs in front of the ship.
Other mistake: In the Banking Clan's HQ, San Hill assesses the situation: "Those guns are destroying our forward positions. The Republic is breaking through!"; then the ground shakes when the giant cannon outside is blasted, and Hill flinches in surprise. But if you look closely, he flinches just before the explosion and the resulting tremor come in.
Continuity mistake: When Durge fires his in-built flamethrower at Obi-Wan, the Jedi Force-crushes the weapon. but in the scene where Obi-Wan's hand is closing into a fist, the flame stream stops just before that; and when the scene switches to Durge's arm, the flamethrower is still firing just before its muzzle is crumpled up.
Deliberate mistake: At the beginning of the chapter, as the scene switches to the surface fighting on Muunilinst, we see a score of droids blasted before the Republic Army's heavy artillery is brought in. But there are no remains on the droids to be seen after the smoke has cleared, whereas there should be something left.
Continuity mistake: During the first duel with Durge and Obi-Wan, Durge's bike is totalled and Obi-Wan's gets hacked to pieces as Durge swings it at Obi. However, as soon as the fight is over, Obi-Wan picks up his bike, completely undamaged, and goes off on his merry way. None of the other trooper's bikes are ever seen anywhere near them.