There's the one where Sherlock Hemlock solves the mystery of who took Ernie's cookies (obviously, it was Cookie Monster).
And there's The Leslie Mostly Show segments with Cookie Monster and Kermit the Frog as guests.
Lefty the Salesman selling Herry Monster a bag (I think, I've seen an episode associated with it recently, can't remember if it was a fully guided one or not; on the other hand, that's only in English to a few of you). Also Lefty selling Ernie a book and a snowman.
Cookie Monster and Beautiful Day Monster explaining "here" and "there" to a smaller monster.
The Count calls the Miami Mice to come down to Sesame Street so he can count them.
A number of Biff and Sully scenes (I think most of them were parts of street stories and only featured in one episode of the domestic Sesame Street), such as one with a rainbow (I know it's from the early 1990s but can't remember which season or number... most of these I don't know the numbers off-hand), Biff telling Sully how sad he was after Sully left work, Biff and Sully babysitting Natasha (I haven't seen that one in any guides yet), and Carrot Time, with Biff at a saloon and Grover as the waiter.
Bert and Ernie: Banana in Ear part 3 (though that was in one of the episodes available only to the wiki for now).
Sesame Street News Flash - Dr. Nobel Price invents the tinker table, Herman the Hoppity Hop, Don Music writes Old MacDonald, Telly and Juliette (I think it's her and not Mona) talking about what they do on a rainy day.
The three Deena and Pearl sketches that are not Deena and Pearl playing house.
Most season 12 Forgetful Jones segments, such as Forgetful saying the alphabet, Song of Forgetful Jones (I am really interested in seeing this), the original Forgetful Jones remembering he needs Buster to go somewhere, and a song, I think it was called "How Could I Forget the Day We Met?"
Herry and Prairie Dawn demonstrating shoe sizes.
I don't have time to check for what episodes features these now, but most of them are in obvious sketch guide pages that list the first or EKA.