Hi, I undid your additions to The Muppet Show for two reasons: sourcing and placement. "As a result, this approach with the characters proved so fertile a source of story material that the series was able to run for two additional seasons while the producers originally thought they could only produce three."
Sourcing, because a quote or citation for saying they originally expected only three seasons is necessary. Placement, characters hadn't been mentioned since the second sentence in the paragraph, the rest focusing more on backstage plots and so on. So it needs to be placed more clearly. Main issue is the sourcing, though. See Muppet Wiki:Sources on how to do this. If you can find one, please feel free to add it back.