Continuity mistake: When Anakin chokes Obi-Wan, the sleeves of Obi-Wan's tunic move up and down his arms between shots, especially his right arm.
Continuity mistake: In the scene following the crash landing of Grievous's flagship where the shuttle is approaching the Senate's "parking garage" (not the Senate building itself or the Jedi Temple as others have said), the shuttle is approaching a section of the landing platform that is void of any other ships. However, in the following shot, another shuttle with different coloring and larger size is in plain view. (00:23:45)
Continuity mistake: During the Sidious and Yoda battle, the number of missing pods off the wall isn't consistent between shots. Sometimes a few are missing, then a lot then back to a few.
Continuity mistake: During the Anakin vs Obi-Wan fight, there is one bit where they are balancing on a thin pole. The shot starts off above them and you can see that there is nothing underneath them. They take a few steps backwards while fighting, but then they both jump off on to one of the arms of the structure they are fighting on.
Continuity mistake: When Dooku uses the Force to throw Obi-Wan through the air, in the shot where Obi-Wan hits the ground and is knocked unconscious, he's not holding his lightsaber, nor does it land anywhere near him. When Anakin walks over to him later, it is suddenly lying next to him. (00:12:40 - 00:14:30)
Continuity mistake: When Owen and Beru are standing next to each other at the end of the movie, in the shot facing them, they are standing closer together than in the previous shot. (02:08:05)
Continuity mistake: In the beginning of the scene where Anakin and Yoda are talking about Anakin's premonitions the outline of Yoda's shadow change between the shots. (00:32:05)
Continuity mistake: After Sidious has killed the Jedis, he confronts Windu. Windu then starts backing out the door and Sidious follows him while pointing his light saber up. When it cuts his saber points down before striking at Windu. (01:08:45)
Continuity mistake: In the first shot of the scene Bail Organa, Yoda and Obi-Wan discuss the future of the twins, most of the holster of Bail Organa's blaster is visible, but in the next shot, most of it is covered by his cloak. (02:03:50)
Continuity mistake: When the buzz droid climbs on Anakin's shuttle it stands in front of R2-D2 with a rotating arm with claws. At first the arm is rotating with the claws out. When it cuts from behind the droid you can see the claws are clenched. (00:06:25)
Continuity mistake: After Darth Sidious kills Mace Windu, Anakin drops his lightsaber to the floor as he sits down. During the rest of the scene, the saber changes position on the floor twice. (01:13:20)
Continuity mistake: The position and existence of the dead bodies in the control centre on Mustafar keep changing between shots, especially during the duel between Anakin and Obi-Wan.
Continuity mistake: When Obiwan and Anakin are fighting on the narrow walkway, lava splashes over it and causes that portion of the building to fall into the magma river. As it is falling, there is a significant amount of lava on the severed end of the walkway, which ends up as the "top" of the tower once floating on the river. For the rest of the scene this lava is gone, and none is shown falling on or by Obi-Wan and Anakin as they scramble along the side of the tower. (01:55:45)
Continuity mistake: When Obi-Wan and Anakin are fighting on the table in the control centre, they are standing/crouching in a different position from the previous shot after every time they kick each other. For example, when Obi-Wan kicks Anakin for the second time, as the shot ends, both of his feet are on the table, but in the next shot, one of his feet are up again.
Continuity mistake: In the scene where the twins are born, there are two shots where Padmé is stroking her son's (Luke) cheek. As the second shot ends, she's still stroking his cheek, but in the next shot, she is no longer touching him. (02:00:45)
Continuity mistake: After Anakin has been turned down as a Master in the council, he is walking with Obi-Wan. While they are walking you can count them passing at least five windows. When it cuts to Obi-Wan saying "Anakin, I'm on your side, I didn't want to put you in this situation", you can see, by looking at the sun shining through the windows, that they have only passed three windows. (00:36:45)
Continuity mistake: The scar over Anakin's eye changes throughout the movie. For example, when he is talking to Yoda about his premonition, the scar is different from the previous scene - the part below his eye moves slightly down and lengthens.
Continuity mistake: On Utapau when Obi-Wan gets off the creature before jumping down to Grievous, he pats the creature on its head. When it cuts his hand is nowhere near the creature. (00:54:45)
Continuity mistake: When C-3PO tells Padme that Anakin hasn't returned from the Jedi Temple and says he will be alright, you see Padme holding her right hand on her left waist. When it cuts she suddenly has her hand in front of her stomach and moves it back to her waist again. (01:20:40)
Continuity mistake: When Obi-Wan and Anakin are fighting Griveous' droids, Palpatine is being dragged against the door. When Griveous says "Stay at your stations" it cuts and we can briefly see Palpatine standing still in the left corner. (00:18:55)
Chosen answer: Powerful force users seem to have some degree of control over their bodies even after death. In the later series, Luke's wife Mara Jade Skywalker only allows her body to disappear when her killer, and nephew Jacen Solo arrives at her funeral as a clue. Thus it appears that a powerful force user can simply choose if they wish their body to disappear.
Darius Angel