I found this info. on the site Tv Tome:
The Jim Henson Hour was an experimentive attempt to recapture the style of The Muppet Show but also incorporate the new and cutting edge puppetry techniques and special effects of the Henson Creature Shop.
13 episodes and a pilot were produced; and although "Sesame Street: 20 Years and Still Counting" was produced as an episode of the show it was never aired with it. Three of the episodes were never aired on American Television until Nickelodeon picked up the series for a brief time, and even then the "Food" episode was never shown.
Most of the episodes followed the same format: the first half hour would be in the MuppetCentral control room where Kermit and friends would have backstage antics a-la The Muppet Show and the second half hour would be an episode of "The Storyteller" or other thirty-minute short film. 9 of the episodes followed this format. The remaining three shows, "Monster Maker", "Secrets of the Muppets", and "Living With Dinosaurs" were different. "Living With Dinosaurs" and "Monster Maker" were hour-long short films and "Secrets of the Muppets" was Jim's explanation of how some of his creations worked. This episode, unlike the other two, did feature some MuppetCentral scenes but they were short and revolved around what Jim was saying.
Unlike The Muppet Show, The Jim Henson Hour featured less reoccuring segments. However, there were a few. The two most prominent and memorable of which were the "Fashion Doll Sketch" and "Hurting Something". The Fashion Doll Sketch was where a little girl and her dog are sitting behind a dollhouse which contained two dolls: Bootsie and Brad. Live actors were made up to appear like the dolls. Hurting Something starred two yuppie monsters and their large pet spider.
This was Henson's last major television program before his death in 1990.
Most of the characters introduced in The Jim Henson Hour haven't been used since. However, some such as Clifford have become popular and have had successful post-JHH careers. The JHH characters also made a cameo appearance in an episode of The Cosby Show entitled "Cliff's Nightmare" in which Cliff has a nightmare after eating a sandwich. This episode was the last time Leon and Digit were used (to the best of my knowledge).
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