There's a number of Jim's work that wasn't mentioned in the special: they touched on Jim's experimental period, but they really only talked about TIME PIECE, while THE CUBE was only mentioned in passing, and YOUTH '68 wasn't mentioned at all. Likewise, THE MUPPET MUSICIANS OF BREMEN got a brief mention as if it were a one-off special, and not part of the discontinued TALES FROM MUPPETLAND series (but then again, MMOB seems to get more attention in general than either HEY, CINDERELLA! or THE FROG PRINCE). Other specials weren't mentioned, like THE CHRISTMAS TOY or MUPPET FAMILY CHRISTMAS, and I think both THE FANTASTIC MISS PIGGY SHOW and THE MUPPETS: A CELEBRATION OF 30 YEARS only had brief clips whizzing by. I think they pretty much touched on his more significant projects, otherwise, they wouldn't have been able to fit everything in an hour-long documentary.
Maybe Ken Burns could do a Henson series.