Jim Henson
Self, various voices (archive footage)
Harry Belafonte
Self
Carol Burnett
Self
John Denver
Self
Frank Oz
Self / Miss Piggy / Fozzie Bear / Animal / Bert / ... (voice)
Steven Spielberg
Self
Ray Charles
Self
Dave Goelz
The Great Gonzo / Beauregard / Boober Fraggle / ... (voice)
Steve Whitmire
Kermit the Frog / Rizzo the Rat / Bean Bunny / ... (voice)
Kevin Clash
Clifford (voice)