Ok- I just popped the ROTJ LD into the player (actually, the DVD-R I made of it), and I stood very close to the TV set (to approximate the distance I sit from my computer screen).
I watched the same scene from Jedi (the 3-ghosts) and I definitely see film "weave" in the scene. I never really noticed this before, but I usually don't sit a-foot-and-a-half from my TV either.