Okay, here is a good example of what I'm talking about:
http://www.youtube.com/watch?v=coypgsWo4Rg&feature=related
on 2:55. his fingers do a wobble when he is pointing up during his speech. Granted, this doesn't happen a lot, so it will take some sharp eyes to look for. Now I know he's 800 years old and all, but unless Yoda is supposed to be senile or something, I do not think this was intentional.
And no, I'm not going to bring up the < ears > again.