20 Things You Didn't Know About Star Wars: Revenge Of The Sith
1. George Lucas Filmed A Scene To "Fix" The Empire Strikes Back During Production
While shooting Revenge of the Sith, Lucas also decided to film a scene for another Star Wars project entirely. For the impending 2004 home video re-release of the original trilogy, Lucas reshot the Emperor's introduction-by-hologram from The Empire Strikes Back with Ian McDiarmid instead.
Though in the original version of the film the part was played by Marjorie Eaton and voiced by Clive Revill, Lucas felt that for the sake of consistency, it'd make more sense to have McDiarmid play the part now.
And so, McDiarmid re-enacted the scene and was inserted into the new version of Empire, as is one of Lucas' many controversial - if, honestly, more sensible - changes to the original trilogy.