Also, the acting coach in ROTS seems to have been mainly for Portman and Christensen. The focus was on developing the background of their new stage of relationship (married, baby, etc.) and also acting as a "rehearsal arbirtrar" to get more time to hone the performance. I think it shows tremendously. Their chemistry works better. They still have shitty dialogue, but their acting is better. Look at Clones, they are both awful in that film, and even though ROTS is not worth writing home about for performances (McGreggor and McDiarmid being the exceptions, as they were in the previous film), Portman and Christensen as a couple seem a lot more natural and a lot more convincing than the near-parody that is seen in the previous entry.