Muppets that Appeared in the Cold Openings

[Dil]

According to IMDB, Johnny Cash always introduced himself using these words: "Hello, I'm Johnny Cash". So in the Cold Opening of his episode, Pops would ask him "Who're You?", and Johnny would most definely reply "Hello, I'm Johnny Cash".

 

[Dil]

As far as I know, Senor Wences, Roger Moore, & Tony Randall were seen leaving from the entrance during the Cold Opening.

Why not...
Loretta Swit
Gladys Knight
Hal Linden
or Wally Boag?

Don't know, huh?