The man sitting next to Larry on his return trip from Arizona is executive producer and frequent "Curb Your Enthusiasm" director Robert B. Weide.
Final performance of Bea Arthur. She quietly announced her retirement from TV, with her appearance in this show's season 5 finale. Bea went back to Broadway and worked on her own Broadway show.
Larry mentions The Sopranos (1999). In a Sopranos episode, Uncle Junior mistakes himself for Larry when he's going through his TV channels.
Pat Finn, the actor who plays the man Larry runs into in Bisby selling his Toyota Prius is the same guy who starred in a series of Toyota ads around 2017.