Here's an idea that might help make Revenge of the Sith match Return of the Jedi's revelations a little more.

When Amidala confronts Anakin about turning to the Dark Side, she begs him to come away with her. It'd seem that this conflicts somewhat with Vader's statement that it was Obi-Wan who "once thought like Luke" in asking him to come with him. In Revenge of the Sith, it doesn't seem that Obi-Wan makes any such offer to Vader.

A way to fix this incongruity would be to change Amidala's lines around a little.

"Come away with me. Leave everything else behind. Obi-Wan knows...He wants to help us."

In this way, Obi-Wan becomes an accomplice in their escape, which also helps solidify the friendship between Anakin and Obi-Wan (and boy does their friendship need solidifying). Even in the most dire circumstances, Obi-Wan is reluctant to "do what he must" and instead offers his friend Anakin a way out - that is, until it becomes clear that he's too far-gone to help.

Edit:

Oh, and looking at that scene, there's a lot more cutting that needs to be done.

Anakin's bullet-points of things he's brought to his "new empire" should definitely be cut down. I'd say "security" would be enough, dropping "freedom", "justice" and "peace" from the list, 'cause security is probably higher on the mind of insecure ol' Anakin than any of the others.

I'd also suggest that Palpatine's ominous "and we shall have peace" line be changed. Peace has universally positive connotations, so it's dissonant to hear it coming out of the mouth of Emperor McMonsterface.

If the Order 66 line is removed, the line could be altered to "And we shall have order", which is more in line with the aspirations of Palpatine's authoritarian dictatorship. In fact, it'd seem that Palpatine's New Order necessitates a hell of a lot of conflict, but that conflict itself may be part of Palpatine's conception of what proper "order" entails.