User blog comment:Pebolim/"Nerds of a Feather" Error (iTunes)/@comment-961279-20110905041128

I've seen some similar artifacting on different pictures. I think it has to do with the size that the video is being scaled to.

However, for the first two pictures, if you watch the scene, the arm is the only thing that moves. That duplicates the cheap animation used in older cartoons where there was limited movement.