Okay, I just saw this and..... Honestly had the same reaction Gina had.
Cerf and Moss seriously perform well as a duo!
Although I know this was a dream Telly had, I feel it would have been more fitting for Little Jerry to have been one of the ones to invite her to the dance, since Gina was a big Little Jerry fan. And Jerry Nelson performed the Genie here, so it's not like he was unavailable to perform the character (unless they didn't expect him to perform the Genie or be there that day).
Probably a topic for a different thread, but I wonder if there's any kind of behind-the-scenes story for Chrissy and Big Jeffy suddenly appearing together so often in the late-1980s/early-1990s. They had Big Jeffy replace the lavendar member of Chrissy and the Alphabeats (and Jeff Moss had voiced the character in a few of his last appearances, so it's not like they were replacing the performer... I used to think Richard Hunt voiced that Alphabeat and thought that's why Jeffy replaced him, though I think I also mistakenly assumed Big Jeffy was Rockin' Richard, seems like a Hunt character), there was the episode where this Chrissy (as opposed to the one in the Monotones) was part of Little Jerry and the Monotones when the lead singer was sick, and Big Jeffy was the only regular member to be in that episode, as well as one or two more times when Elmo, Chrissy, and Big Jeffy were a trio, and there's this scene where the two appear together but seem to appear independently of each other (as opposed to being a duo or part of the same group).