Continuity mistake: In the wideshot where Obi-Wan is about to bring Zam Wessel outside the nightclub, the man by the bar (Anthony Daniels, who plays C-3PO) is standing with his back towards them. In the next shot, he is facing them and no longer standing by the bar. The two women he was talking to have moved as well. (00:22:55)
Continuity mistake: During the speeder chase, Obi-Wan's hair is waving wildly in the wind like it should. But not so during a shot when he tells Anakin "You know I don't like it when you do that." It is completely still, not moving at all, even though they are still driving at some 100 mph. In the shot after that, it's back to normal again.
Continuity mistake: When Obi-Wan and the two Kaminoians are admiring the clone troopers, the Prime Minister says 'Magnificent aren't they?' and it cuts to a platoon of troopers marching towards the camera. Watch the trooper at the head of the group (the one with yellow markings): the white armour on his legs keeps disappearing and reappearing.
Continuity mistake: When Anakin and Padmé are talking at night at the lake retreat, the flames in the fireplace are inconsistent between shots. (00:51:35)
Continuity mistake: After Padmé falls down onto the conveyor belt, Anakin jumps down after her, and right before he lands, there's a clear shot of the conveyor belt moving the same way Padmé went. Judging from the speed of the conveyor belt and the fact that she was only a few seconds ahead of Anakin, Padmé should be visible, but she's nowhere to be seen. (01:34:00)
Continuity mistake: In the bar scene on Coruscant, when Anakin is tracking Zam Wessel through the bar, his Jedi braid changes sides - it is on the left side of his head in a shot where he is seen from behind. At all other times in the movie, the braid is on the right side of his head. (00:22:40)
Continuity mistake: When Obi-Wan and Anakin enter the nightclub, in the first shot, there are people in front of and behind them. In the next shot, some of them have disappeared, some have changed position, and there are some people that were not there in the previous shot. Then during the last shots of their conversation, the surroundings and the amount of people around them changes a few times. (00:21:10)
Revealing mistake: After R2-D2 begins to drag C-3PO's head across the arena, there's a shot of several Jedi fighting. A man wearing a dark brown tunic falls over dead, but if you watch closely, you can see that he was never actually hit by any laserbolt. (01:50:15)
Continuity mistake: When Anakin is talking to Watto, the positions and existence of some of the objects surrounding Watto keeps changing between shots.
Continuity mistake: When Anakin and Padme are going into the droid factory on Geonosis, watch the last Geonosion warrior Anakin kills before going through the door into the actual droid factory. Anakin's lightsaber goes straight through the shoulder of the warrior, but nothing happens. Then Anakin proceeds to kill it using a force push and then slicing it in half. (01:37:45)
Continuity mistake: During the arena battle on Geonosis, Jango Fett flies in to go after Mace Windu. When he lands, he holds nothing in his hand, but as the Reek detects him, he has his blaster pistol in the left hand. The Reek stampedes him, and there Fett is missing his pistol, but when the beast turns around and charges again, Fett suddenly holds the pistol in his right hand.
Continuity mistake: On Tatooine, after Anakin's mother died, and they laid her to rest, you notice the shadows of the tombstone's are all facing one direction. When R2-D2 comes over, you'll notice that his shadow is going in a different direction. Can't be explained by the two suns, as we've seen many times that they don't produce two distinct shadows. (01:27:45)
Continuity mistake: During Obi-Wan's tour at the clone facility, as Lama Su explains that they modify the genetic structure of the clones, he is walking in front of Obi-Wan. As the next shot begins, he is walking behind him. Then, when he mentions the unaltered clone, he and Obi-Wan are walking side by side, but in the next shot, he is once again in front of him. (00:44:50)