Luke's rescue clip: http://www.youtube.com/watch?v=nwULLrS8ZXw
@ 6:46, downfall of the Tauntaun: Is it just me or does anyone else notice that the falling Tauntaun still has this effect of a stop-motion-creature (especially the leg)? It doesn't look natural, i. e. smooth.
As far as I recall Adywan did improve the movement of the tauntaun in the first scene we see one (Luke riding it), didn't he?