None. Zero. Nada. Zip.
I just bought the complete box which contains a double disc of extras, a printed script of the pilot and a little episode guide booklet so you can look up the synopsis of an episode without removing the first or last disc of a season from its case. If I'd bought the individual seasons and then discovered this...
Oh, and I just saw a poster for a live action Disney movie (Enchanted I think) featuring a CGI furry mascot who no doubt will wisecrack all through the movie just like the ones in the animated movies. My immediate reaction? At last the real reason for Disney buying Pixar is revealed!