I am constantly amazed by the relentless pace of advances in computer generated animations.  However, most animated figures still seem to be filled with air.  Even motion-recording doesn't seem to correctly reflect the distribution of weight and momentum in moving figures.  While some of this is due to using abuse of slow-motion over zooming — probably due to lack of details and depth in animated faces and eyes — one can clearly see this problem whenever a figure walks around.  Given that realistic presentation of weight and momentum is usually cheaper, in terms of computation, than other vogue animation graphics techniques, I think this is an area that could see huge improvements in the near future.