An episode of Susan and Elliot's show has always been an option for EGSNP, but figuring out what the heck to do with it was tricky. This was mostly because it's a movie review show.
Either they'd review an actual movie, which would be filled with spoilers, or a made-up movie that they would have to over-explain for anything to work.
Susan having something tangentially related to movies that she wants to talk about, however? That works, so here we are. Not only is this effectively an episode of their show, but this is after they've gotten used to doing this, so we get to see what they're like while "on" for the camera. Both of them are a bit different than when the camera's off, which I think is fun, at least.