The Annotated screenplays gives very little info. The peecher book is great, and so is the novelization as well as the comics adaptation by al williamson.
I would also recommend getting a copy of art of return of the jedi pre special editions. Skywalking has little tidbits of info as well. and of course there are those classic bantha tracks, cinematographer, and cinefex articles. I know they've had little bits in previous issues of the star wars insider. There is the issue that has the lost cut as well as the sandstorm scene by dr. david west reynolds. Then there is the 15th ann. issue of jedi.
Oh yeah and the notes on the limited edition return of the jedi soundtrack as issued by rca victor in 1997 special edition. There are little bits of music from the deleted scenes of jedi, it's funny we have never seen the footage but the music exists. Lucas probalbly has the damn stuff in his little fort knox he calls the lucasfilm archives.
There is some info you can get on the jedi bendu script site as well as t bones star wars universe under jedi deleted scenes.
He also has links to several other sites of note.
And by the annotated screenplays that early draft of jedi is authenticated, the revised rough draft.
Yes the one with lando's death is a fake and the kenobi scene in that draft is lifted from the novelization, the
lightsaber crafting scene was probalbly taken from peecher's book.