Going back to my earliest post in the thread, about how Kasdan treated the scene of Leia's capture by Jabba:
JABBA
(to Leia, in Huttese)
I have seen you like to kiss. I like the way you kiss.
(he grins)
And I like to kiss, also!
Leia looks at Threepio, questioningly.
THREEPIO
You're not going to like it, Your Highness.
LEIA
Death?
THREEPIO
Worse.Jabba speaks to the Guards holding Leia and they bring her toward him. Inexorably, her tiny face crosses the distance to his immense blob of a head. Jabba puckers up. Leia looks sick.
Given what went on in the story conferences, I'm now much more inclined to blame Kasdan for this scene, which implies the proverbial "fate worse than death" (i.e. rape) happening to Leia offscreen.
Worth remembering here is that in the Raiders script Kasdan gave Marion a line about her life at the Raven Bar in Nepal: "I worked here. And I wasn't the bartender!" implying that she was forced to prostitute herself to survive.
Later in the third draft script of Raiders, when Marion is wearing that sheer nightgown aboard the Bantu Wind, there was another reference to this idea:
MARION
I feel like a virgin bride in this.
INDY
That's what you look like.
MARION
(takes a drink)
There are some things you can recapture in this life, but that isn't one of them.
This idea was cut from the final film.
Notably, in a later draft of ROTJ by Kasdan (glimpsed later in the Making) the above dialogue apparently disappears, and the scene between Jabba and Leia approaches the final film much more closely. Presumably Lucas--given his insistence that "this is a fairytale" and "nothing bad happens to anybody"--urged Kasdan to drop this disturbing implication. (To which I can only say: Good on him.)
In fact Lucas wanted to further edit Kasdan's revised scene, so that Leia herself was cognizant of the fact that she was never in any real danger:
Lando quickly moves in, and attempts to lead Leia away.
JABBA
Wait! Bring her to me.
Lando and Leia stop dead in their tracks. Lando gives her a worried look.
LEIA
I'll be all right.
LANDO
I'm not so sure.
I'm reminded of the apparent debate in ESB over whether Luke should lose a hand. Lucas's second draft script (the first to feature the Father Vader revelation) doesn't include that element; it only appears in Kasdan's first crack at the screenplay. (In that version Luke loses his left arm at the elbow, and gets a nakedly mechanical replacement much like Anakin's in the prequels.) I now wonder if it wasn't Kasdan who suggested this violent means of having Vader defeat Luke.
But in Kasdan's next draft the calls for the secret pages in which Luke loses a hand are entirely absent, although those for the Father Vader dialogue remain. Perhaps Lucas got cold feet about "castrating" his hero? In any event, the maiming (now transferred to the right hand) was reinserted by the time of the final shooting script.
PS: Just noticed one unusual thing in Kasdan's second draft script of ROTJ: in the Throne Room scene Vader doesn't throw the Emperor down a convenient bottomless pit but rather out the window and into space. Luke and Vader somehow avoid being sucked out themselves.