I'm not sure if this has been mentioned yet, but remember the old PBS kid's show Shining Time Station? In the episode "Mr. Conductor's Movie," when Schemer suggests big-name stars to star in the movie, he says to himself, "...John Wayne, Arnold Schwarzenegger, Big Bird!"
Interestingly enough, Leonard Jackson, who was a Sesame Street regular in 1989, also played Harry in Shining Time Station's first season (the one with Ringo Starr).