I had a few more ideas:

Palpatine: Execute order 64 -- no, wait -- 65? 67? Just wipe them out. All of them.
I am not sure how often George is seen in the opera scene. If it's more than once he could change colors every time.
Mace: I am Mace Zeus Windu.
Palpatine: Zeus?
Mace: Yeah, Zeus! As in, father of Apollo? Mt. Olympus? Don't f*ck with me or I'll shove a lightning bolt up your ass! (from Die Hard with a Vengeance)
On Mustafar Kenobi bursts into song (I didn't watch Moulin Rouge for nothing):
My gift is my song... and this one's for you
And you can tell everybody that this is your song
It may be quite simple, but now that it's done
I hope you don't mind, I hope you don't mind
That I put down in words...
How wonderful life is, now you're in the world
(Then Anakin goes: NOOOOOOOOOOOOOO!)