This video was recently on YouTube for about a month, then the uploaders account was terminated. I didn't realize the whole thing was online until a week ago, the upload date was a month earlier (and it got removed a week after I found it).
Though we currently can't watch it again (well, those of you who have the video can), I'd like to make some observations after watching it again for the first time since about 1994.
* The scenes with PJ and Kai-Lee kinda feel like a less-technology-advanced precursor to The Jim Henson Hour. They pretty much stay in front of a white background, kinda as if they are inside paper (well, the two start out being drawn and become their usual selves). They look at video of Picklepuss and Pop in what seems like a projected screen, while when they interact with Jonathan Frith, they turn around and appear in a television screen as opposed to appearing in person with Frith.
* Picklepuss kinda sounds different from other Caroll Spinney voices I can identify, but at times his voice seems to have hints of a young Oscar the Grouch (particularly when he makes his "Samata" pun) or a scratchy Big Bird voice.
* Pop's mouth movements seem limited. I wonder if Caroll Spinney used the techniques done at Sesame Street live, where the performers have a control in the characters hand to make the mouths move. Though I think I've heard the mouth was radio-controlled, when I think of that I think technology like what was done with the Gorgs faces, but if it was done with a Waldo, then it's a surprise that the suit performer was still doing the voice (I would think for Waldo-technology faces the voices were either done by the performer controlling the face or a non-puppeteer voice actor).
* On a similar note, during most of the scenes where Pop draws, we don't really see his face as he talks, we just see his hands while his voice is heard. Even when his drawing comes to life and the two converse, we don't really see Pop (no cutting back and forth or anything). Makes me wonder if Spinney was wearing the head in those scenes, though the first time we see Pop draw, we do see his head in the shot.
* This was my favorite of the Play-Along Videos, yet I do not remember Artie at all (I have seen him mentioned on the wiki and seen the pictures). I'm surprised there was so much of him in this, because I also don't remember the "Face Challenge" or "Line Game" (I also don't remember Stella). Even seeing it again after all these years, none of the Artie stuff rings a bell to me.
* When Kermit draws animals, was he really a live-hand puppet like the wiki says? We only see the live hands in first-person shots of him drawing, we never see the puppet and live hands at the same time, in wide shots of Kermit he clearly has arm wires as usual (though we don't really see his hands much in the wide shots). I think the performer just wore gloves resembling Kermit's hands, separate from his body.
* I like how Caroll Spinney receives top billing in the credits. He deserved it. Also interesting to see Jonathan Frith credited among the Muppet performers (though that credit doesn't list them as "Muppet performers", the credit says "featuring") since he has an on-screen scene, but technically he was a Muppet performer since he performed Kermit's hands when he drew animals.
*Most of the familiar Muppets only make brief cameos, and the credits don't credit Frank Oz or Dave Goelz at all (I wonder how I didn't notice as a kid). Jim Henson is really the only TMS performer to have a sizeable part. This means not getting many familiar characters, but during the period between The Muppet Show and The Jim Henson Hour, this video (and many of the others) gave performers who didn't have their own Muppets characters like Kevin Clash, Camille Bonora, and David Rudman a chance to have their own characters.