Unanswered question(s)

Rating: 10/10 (20 May 2005)

I was shocked at how amazing this film was in all respects, and it answers almost every question that I could think of, except for one.
(SPOILER ALERT): in ROTJ, when Luke cuts off Vader's hand, he (Vader) screams. However, we now confirm that all of Vader's limbs are robotic, so why does he appear to scream in pain?
Other than that, I can't think of an unanswered question!
Can anyone attempt to answer this, or have other unanswered questions to discuss?
**Another question my wife brought up, also from ROTJ: when Luke asks Leia "what do you remember about your mother" and she responds something about her being pretty but sad, we all assume that she was talking about their birth mother (Padme). However, as Padme dies in childbirth, there is no way Leia remembers her. I think the natural answer to this is that she is simply remembering who she believed was her real mother, Ms. Organa.