According to both Wikipedia and various Muppets wikis, The Jim Henson Hour has only 12 episodes. The Included "Sesame Street: 20 and Still Counting" is not a part of the show, it was simply produced during production of this series. https://muppet.fandom.com/wiki/Sesame_Street:_20_and_Still_Counting In the section regarding production they state that it was "concieved" as part of the series but not included in it.