Spike Lee’s “She’s Gotta Have It” is only available in the unrated cut on laserdisc (but that will probably be on blu-ray from Criterion at some point)
Peter Bogdanovich’s “Texasville” director’s cut
I know that William Friedkin’s “Jade” director’s cut was released on VHS, if it was released on LD that would probably be the best official release it’s had
James Cameron’s “Piranha II” director’s cut
“It’s A Mad, Mad, Mad, Mad World” roadshow cut - I forget the distinction here, but there’s something about this cut that is different than either of what’s on the Criterion disc
“Spartacus” - theatrical edit pre-restoration
“Monty Python and the Holy Grail” - theatrical edit pre-restoration (early copies)
“Lawrence of Arabia” - pre-restoration video edit
William Friedkin’s “Cruising” - my understanding is that the theatrical cut was modified in some way for all the home video releases, but whatever you want to call that “initial video cut”, it is unavailable now.

exclusive bonus features (besides commentaries)
Ghostbusters - at least one deleted scene
Poltergeist
This is Spinal Tap - has an early TV appearance by Tap, never released elsewhere
sex, lies and videotape - this LD is the only release of Soderbergh’s short film “Winston”

there’s a bunch of exclusive commentaries that are already floating around on-line, I don’t want to list them all right now.