I know this seems kind of random, and I'm not sure if it has been brought up yet. (I've read about 100+ pages of this discussion so far between calls at work, so I'm trying to catch up, but that's A LOT of info to cover...)
Anyway, I noticed that on Dagobah (right before the X-Wing starts to sink) when Luke is doing the one-armed handstand with Yoda standing on his foot, right after he begins to levitate the first stone it cuts to R2 who slowly turns around, but looking closely you can see two little feet underneath R2. Perhaps this could be obscured by fog?
I've noticed that in general many shots with R2, because of the way he moves, make it seem obvious that Kenny Baker is acting inside. It's not necessarily a big deal, we know these are only movies after all, but is it worth a look at to see if there's any way to smooth/alter R2's movement in any shots so that it looks more like he's moving in his "wheel mode" instead of an odd wobbling?
I know this is part of R2's characterization, and I like his quirkiness at times, just not when it's too obvious, that's all. What does everyone else think?