I also noticed an interesting deviation between the 16mm mono and the laserdisc rip.
Remember how in the special edition (and presumably the 70mm), Yoda's speech (when he's riding on Luke's back)
"Anger, fear agression..the dark side of the force are they. Easily they flow...quick to join you in a fight...."
is much louder in relation to the R2 beeping sound?
The 16mm mono has the loud version- the special edition version.