Mistakes
In the scene where Anakin arrives on Mustafar and tells R2-D2 to stay with the ship, he pulls the hood of his robe over his head with two organic hands. His right hand should be mechanical. [This mistake is mentioned in the audio commentary: this shot is taken from a shot of Obi-Wan later in the film when leaving Padme's apartment. Still a mistake, though.] See more...
Trivia
George Lucas makes a cameo appearance during the opera scene. He is the blue faced being, named Baron Papanoida, that you see outside Palpatine's box. It marks Lucas' first and only appearance in any of the Star Wars films; also in that scene is Lucas' daughter Amanda and her boyfriend. Lucas also reportedly provides the sound of General Grievous' coughing. See more...
Movie Mistakes blog
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Star Wars: Episode III - Revenge of the Sith (2005) - 16 quotes
Directed by George Lucas, starring Ewan McGregor, Hayden Christensen, Ian McDiarmid, Jimmy Smits, Natalie Portman, Samuel L. Jackson, Anthony Daniels, Christopher Lee, Frank Oz, James Earl Jones, Kenny Baker, Peter Mayhew (add more)
Genres: Action, Adventure, Fantasy, Sci-fi
There are a few minor issues, such as Obi-Wan saying he hasn't used that name "since before you were born", among others, which can easily be attributed to character mistakes, ie. mis-remembering things, rather than "real" movie mistakes.
Obi-Wan Kenobi: Oh, I have a bad feeling about this!
Obi-Wan Kenobi: Anakin, Chancellor Palpatine is evil!
Anakin: From my point of view the Jedi are evil!
Obi-Wan Kenobi: Well then you are lost!
General Grevious: I was expecting someone with your reputation to be older.
Anakin: General Grevious, you're shorter than I expected.
Count Dooku: I sense great fear in you, Skywalker. You have hate, You have anger, but you don't use them
Yoda: Destroy the Sith we must!
Darth Sidious: At last the Jedi are no more.
Yoda: Not if anything to say about it I have. At an end your rule is and not short enough it was.
Darth Sidious: The time has come. Execute Order Sixty-Six.
Anakin: I sense Dooku.
Obi-Wan Kenobi: I sense a trap.
Anakin: Next move?
Obi-Wan Kenobi: Spring the trap.
Count Dooku: I've been looking forward to this.
Anakin: My powers have doubled since the last time we met, Count.
Count Dooku: Good. Twice the pride, double the fall.
The Emperor: You will soon become a very powerful Sith. Henceforth, you shall be known as Darth....Vader.
Anakin Skywalker: Thank you, my master.
The Emperor: Rise.
Obi-Wan Kenobi: [Screaming in anguish at Anakin] You were the chosen one! It was said that you'd destroy the Sith - not join them!
Anakin Skywalker: [To Padme] The Jedi turned against me. Don't you turn against me.
Padme: So this is how liberty dies - with thunderous applause.
Darth Sidious: [To Yoda] I've been waiting a long time for this, my little green friend.
The Emperor: Every single Jedi, including your friend Obi-Wan, is now an enemy of the republic. Do what must be done.
Mace Windu: You are under arrest, Chancellor.
Senator Palpatine: Are you threatening me, Master Jedi?