Here's something that's been online for a few years... The opening trailers on the UK release of Gonzo Presents Muppet Weird Stuff, including individual promos for The Kermit and Piggy Story and Muppet Moments.
These promos are a bit odd... There's no voice-over, and we mainly get a few samples of certain scenes. Almost like that "preview other Sesame Street videos" feature on Sony Wonder releases, or the feature on iTunes where you can preview a short clip, only multiple clips. Some things are odd... Like for The Kermit and Piggy Story, they chose an out-of-context clip where somebody gets karate-chopped for asking Miss Piggy if she works there, with no clips where it's said that she was fired. And for Muppet Moments, the beginning of the Sax and Violence clip is shown... But the promo also showed the last second of the intro before the clip began, so people see an explosion in the attic and then the fade to that clip.
I wonder if Virgin Video had promos for all of the Playhouse Videos that were released by Virgin in the UK.
Interestingly, while those video promos just show a selection of clips, it also includes the full openings to Fraggle Rock and Muppet Babies, without saying anything about video releases. I guess that's an upside to these videos not having The Muppet Show opening.