Here's Guy Smiley's first appearance...
It's interesting. I think Caroll Spinney performs Guy in this one. It barely sounds like any Spinney voice I know of, but at times in the sketch he sort of talks like the farmer Caroll performed in The Magic Apple segment. The voice kind of has a cartoony quality to it. The performance also doesn't seem as stiff or awkward as some of the Anything Muppets Caroll Spinney performed. Assuming that it's Caroll, I wonder if this is the only solo Anything Muppet sketch he performed in.
The Brand X sketch is funny (for years I've desired to do a sketch comedy "commercial" that ends with the spokesman saying "do not buy this product", I think this is the first time I've seen a "commercial" with a line like that), but it seems more like entertainment than educational. It barely teaches the letter X, with the letter only being part of the brand name. It would have been great if the stains were shaped like the letter X. The first season show content lists episode 10 as the only episode from the first season to include it, though the document doesn't have a "dump" note by it so it might have aired in later seasons.
It's interesting how in the first season they seemed to avoid giving recurring minor characters names, or consistent names. Various monsters and Anything Muppets are seen a lot but are rarely mentioned by name, even if they star in the sketches. There are times when Cookie Monster, Beautiful Day Monster, or Grover interact with Ernie or Kermit or somebody, and yet they tend to avoid mentioning the names (though Beautiful Day Monster was referred to by a number of different names in various segments). There's at least three different segments where Betty Lou is referred to by a different name (she's Helen Happy in one segment, Lucy Jones in another, and she's called Betty Lou in The Mr. and Mrs. Game). And then Guy Smiley goes from being an unnamed spokesman (I assume the script didn't refer to him by any sort of proper name) to being called Sonny Friendly and then finally he's called Guy Smiley, all in the first season.