I was just watching the credits again, and noticed that despite how very little Elmo this has, the credits still say "And Kevin Clash as Elmo".
I was thinking that all of the Monsterpiece Theater segments were shown with whatever openings the segments originally had, but I read in the 40th anniversary book that Twin Beaks premiered in season 22 and on Muppet Wiki that the MT opening premiered in 1992 (season 23), and Twin Beaks is shown with the second opening. I guess it's not too big a deal (it's good that this set includes both Monsterpiece Theater openings that were parodies of actual Masterpiece Theater openings).
After watching all the segments, I'm convinced that the image at the bottom left corner is from 30 Rocks, even though there are images elsewhere on the cover.
I'm thinking that another good, similar two-disc set idea would be a "Best of Sesame Street Game Shows". That would obviously include a lot of Guy Smiley, and should include all the game shows with other hosts (even if it means double-dipping on Family Food), maybe even include some of the street stories invovling game shows (though most of them, at least the ones after the format change, have been released on DVD). Disc 1's bonus features could include both parts of The Mr. and Mrs. Game (makes most sense for a two-part sketch to be included as bonus features), and disc 2 could include The Alphabet Game as a bonus feature (though it'd be more appropriate as a disc 1 bonus).
Except for Jon & Kate Plus 8, pretty much everything on here could have been viewed on YouTube. Before this came out I didn't think there were many rare parodies (unless they were so rare I hadn't heard of them), the rarest one I could think of being The Count's "Miami Mice" appearance (reminds me of how "Beat the Time: Grover" used to be so rare). But then I remembered that Sesame Street Unpaved has a listing of parodies, which includes a number of titles I know nothing about, aside from being on the list.