On the DVD interview, Jason Alexander confesses he was furious with Larry David for not writing him into this episode, and insisted that he must be in every future episodes, even just for a bit part.
This is the only episode in which Jason Alexander does not appear. Michael Richards doesn't appear in it either, but he was also absent from The Chinese Restaurant (1991).
Larry David learned of the pen that writes upside down from executive producer George Shapiro who owned one. He gave it to David during a meeting.
Jerry sleeping on sofa cushions on the floor was inspired by Jerry Seinfeld's real-life experience. When visiting his mother, Seinfeld would sleep this way to avoid the uncomfortable sofa bed.
This is the first time there was any explanation about why Jerry (Jerry Seinfeld) and Elaine (Julia Louis-Dreyfus) didn't stay together after The Deal (1991), which was supposed to be the season 2 finale. They had become romantic partners again, but in the first few episodes of season 3, they clearly were just friends again, but there was no resolution.