There are a few episodes that I specifically remember...
-The episode where they reenacted "Snow White," with Skeeter playing Snow White and Piggy stuck in the role of the Wicked Queen. I loved how Piggy did everything in her power to force Skeeter out of Snow White's role simply because she didn't want Prince Charming (Kermit) to kiss Skeeter. Gonzo, Bunsen, Beaker, Fozzie, Rowlf, Scooter and Animal as the dwarves was classic (Animal: ME CRAZY!), especially with the dwarves running a beauty salon instead of mining for diamonds. And I just realized this only a few years ago, but at the end when Nanny tells the kids that she always wanted to play the Wicked Queen, I swear she only said it so that Piggy would get out of her snit.
-The episode where the babies tried their hand at making cartoons using Nanny's old video camera. They had some pretty creative ideas for a bunch of babies. (Both this episode and the Snow White one were on a videotape my grandmother kept around her house for her grandkids...I wonder if she still has it?)
-The "art museum" episode, where the gang made their own art museum after an accident left Skeeter with a sprained ankle and caused Nanny to cancel their trip to the real art museum. And in every painting Gonzo made, a pink rollerskate would mysteriously appear (the story being that Skeeter had tripped over Piggy's rollerskate, and Piggy had swapped her skate for Gonzo's so that she wouldn't get blamed for Skeeter getting hurt).
-The episode where Fozzie loses his teddy bear and the group winds up journeying into the troll mines where trolls hoarde all the lost toys just to get Fozzie's teddy back.