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.
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.