Continuity mistake: When Anakin is talking to Yoda about his premonition, the shadows and the intensity of the sunlight shining through the windows keeps changing, depending on the camera angle.
Continuity mistake: Just before leaving in his spacecraft to go and fight against general Grievous, Obi-Wan Kenobi is seen being briefed by Clone Commander Cody. During the briefing, you can see that at least one of the clone troopers on the right does not have the same head as the Clone Commander. But, when Obi-Wan climbs onto the wing of his spacecraft and enters it, the clone troopers on the right suddenly all have the same head as the Clone Commander.
Continuity mistake: In the beginning, when Obi-Wan and Anakin are returning after saving Palpatine, you can see their ship approaching the platform is about to go under a large shadow. But in the next shot, it takes quite a while for the shadow to even touch the ship, and the shadow is of a different position/size. (The shadow is from an over-hang above them, for other ships I assume).
Continuity mistake: In the Palpatine/Yoda lightsaber duel, during the second time they lock sabers, Palpatine's blade is pointed down, then in a closeup of his face, his blade is at an upward angle. Then when it cuts back to Yoda, his blade is pointed down again even though blades were constantly locked. This may only be noticeable in widescreen.
Continuity mistake: In the Anakin vs Obi-Wan fight scene, when they are fighting in the small hallway, Anakin's lightsaber marks the wall, but in future shots the mark on the wall has disappeared.
Continuity mistake: When Anakin is gripping Obi-Wan's right arm as he's choking him, his hand changes position on his arm a few times.
Continuity mistake: On Utapau when Obi-Wan is looking down upon Grievous and the Separatist leaders, you can see Grievous is very far away (judging by the floor panels, perhaps 10 floor panel widths taking into account the diagonal angle at which Obi-Wan is looking at Grievous). Obi-Wan proceeds to jump straight down, but in the next shot where Obi-Wan lands, Obi-Wan is only 1 floor panel width away from Grievous. Then, in the next shot which shows Obi-Wan surrounded by droids, he is now 2 floor panel widths away from Grievous.
Continuity mistake: When Padmé is lying unconscious after Anakin uses the Force to choke her, her position on the floor keeps changing between shots, sometimes dramatically. Watch the pattern on the floor and the container behind her.
Continuity mistake: During the Sidious and Yoda battle, the Emperor throws down several pods at Yoda that pile up on the floor.The pile changes in the number and position of the pods between scenes. This is especially noticeable when Yoda's lightsaber is shown falling to the ground, almost no pods are on the floor verses many pods when Yoda falls.
Continuity mistake: After the crash landing on Coruscant, Anakin, Kenobi, and Palpatine take a shuttle to the Jedi Council. In the first shot as the shuttle is landing, all shadows are parallel with the edge of the landing area. In the next shot when the shuttle doors open, all shadows have shifted 45-degrees clockwise.
Continuity mistake: During the scene where Padmé tells Anakin that she's pregnant, the shadows keep changing between shots.
Continuity mistake: In the very beginning, Obi-Wan and Anakin are flying near that big republic ship. Notice that it is calm everywhere even under the ship, but in the very next shot their are hundreds of ships and starfighters going by.
Continuity mistake: Just as Yoda starts fighting Darth Sidious, Yoda's walking stick disappears from the ground behind him.
Continuity mistake: When Obi-Wan says to General Grevious, "Not this time. And this time you won't escape", you can tell that it is a flipped shot because the moles on Obi-Wan's forehead are the opposite way round to how they are normally.
Continuity mistake: In the fight scene between Obi-Wan and Grievous, look closely at the lightsabers in Grievous' right hands as he ignites them. The one on top is an Obi-Wan hilt(blue) and the bottom is an Anakin hilt(green). Throughout the fight, these two sabers alternate colors constantly between shots. When Grievous' hand is severed the second time, he drops the Obi-Wan(green) and retains the Anakin(blue).
Continuity mistake: When Anakin, Obi Wan and Palpatine are brought to General Grievous, as they are walking in just as Grievous says "ah yes" Anakin and Obi Wan turn to the left while Palpatine stands a little away from them. When Grievous says "General Kenobi, we've been waiting for you" Anakin and Obi Wan are turning left again.
Continuity mistake: The emperor sits up as he's using force lightning on Mace then a few seconds later he sits up again.
Continuity mistake: As Palpatine stands to face the Jedi, his right hand starts to turn around for his lightsaber. In the close up, his hand turns around again.
Continuity mistake: During the fight scene between Obi-Wan and Grievous, Grievous has the lower half of his left hand and upper half of his right hand severed during the saber duel. However, as he gets into his vehicle, the damage done to his right hand reverses itself and he is missing the lower half instead.
Answer: Darth Vader has a special chamber in which parts of the suit can be removed for comfort. When he is not in the chamber he must wear it at all times in order to survive.