Looking at the guide for episode 3784, the second-to-last episode of the 29th season, I noticed that this episode has three segments with Grover making their debuts in this one. Then I clicked on each image to see what other episodes feature them, and it turns out that all three of these Grover segments (Grover and Mr. Johnson at the ballpark, Kermit and Grover show light and dark, and Theater in the Park: Richard the Last) only appeared in this episode, never appearing in another episode, though I think they appeared internationally and I know that at least two of them were later shown on Play with Me Sesame (and are available on Play with Me Sesame DVDs).
In fact, there's been quite a few segments produced since at least the late-1990s that were clearly produced for the domestic version but never did, while they did air internationally, though English copies have made their way to fans (some aired on Play with Me Sesame, some have officially been uploaded online in English, I think some have been released on DVD). I'm starting to wonder how likely it is that classic segments produced during the 1970s and 1980s would have aired internationally but not on the domestic Sesame Street (and I don't think the wiki notes many early segments anymore that don't have a known episode number).