I had RotJ on Virtual Console and sadly there is no Yub Nub.
Ghaaagh! I was just joking. I didn't really think they'd take it out! It's in cart version!
Yub Nub starts at 3:22. Before that is another ass vehicle level. Also, when the Death Star explodes (2:45) the explosion comes from the doesn't even originate from the right part of the screen.