Yes... And don't forget the episode of South Park where the boys are recreating the crucification plays, where Carpmen's nailed to a cross... To which a strolling Officer Barbrady comments: "t, turtle" before walking away. Obviously an homage to the Typewriter Guy. Or the episode of Drawn Together where the housemates look at a ringing telephone oddly, imitating the sketch with the Sesame Street Martians. There was also the episode of South Park with special guest star Wing, she was singing songs of Abba during the episode. This one ends with her performing at the wedding for Sylvester Stallone's son. She sings the song "Sing", which while recorded by Abba belongs to the pantheon of Sesame Street songs in its own right. Hope this helps, any others feel free to post 'em here.