All of Kermit's frog friends are named after the King Arthur's Knights of the Round Table (Gawain, Ector, Kaye, and Garth, a variation from Gareth).
The debut of Sweetums the ogre, who would make frequent appearances in later Muppet specials, TV shows, and movies.
A number of characters in this TV special were performed and voiced by separate performers. Jerry Nelson voiced Robin but Frank Oz provided the puppetry, Carl Banas provided the voice of Sweetums while Jerry Nelson was the one performing inside the character suit, and Jerry Juhl performed the voice of Taminella while Richard Hunt performed the puppetry.