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Wow! George the Janitor appears within the first few seconds of the first clip and has the first few lines of the song (but his voice is different - doesn't sound like Frank Oz). He was a major character in Season 1, but became a tertiary character in Season 2. I hear he pretty much disappears after that. I theorize that maybe aside from running out of ideas for him that Frank Oz probably just had too many other characters on his plate. He was performing both Miss Piggy and Fozzie, two major characters, and Animal and Sam the Eagle, two semi-major characters.

Boppity (the big-eared blue monster) appears on the right at around the 0:22 mark.

The singing fruits and vegetables on the stand have been used various times on the show.

Except for Gonzo and Rizzo and some of the many generic frogs and pigs they use, I don't recognize any of the others.