Never thought the line "I know" could be better used than in ESB, but it worked very well at the end of the episode, Ahsoka pulled out Anakin's inner thought very smoothly with it.
The score was rather nice too. The last variation of the force theme could be a nice alternative for the order 66 sequence if it covered the whole musical phrase and not just half of it.
Very nice episode, loved the masked guards of the Jedi. Had a strange feeling of series finale though. If the series comes back with a sixth season, how will they manage to reverse all this situation with Ahsoka, which was pretty conclusive?