I can report a sound difference I've never seen mentioned before. I have the 1992 PS video release, and the TR47 DVD set. The biggest difference(other than the DVD being widescreen and the vhs looking better on my 9" while the DVD looks better on my 32" digital) is C-3PO's line - "The tractor beam is coupled to the main power reactor at seven locations. A power loss at one of the terminals will allow the ship to leave" being absent from every set but the 92 tape collection. However, I've noticed a new difference. In ESB, when Yoda mentions Luke's father.

TR47 - "Father?! How fortunate was he. Powerful Jedi."

92 VHS - "Father?! How fortunate was he. How fortunate..."

EDIT

Ok, right after I typed this, I played back the DVD. I heard "How fortunate..." so I cheacked my tape again, and sure enough the line is "Powerful Jedi."

There's something in the delivery that seems to mutate the line if one doesn't pay attention. I haven't caught that in 12 years.