This is the last ever episode where the "Back in The 90's" song is played over the credit rolls.
Hollyhock's return address is listed as being in Bradley Whitford Dorm in Wesleyan. Bradley Whitford went to Wesleyan University.
The actor at the door delivering the pizza to Mr. Peanutbutter is the dog that Princess Carolyn recruited from Bojack's class in Intermediate Scene Study w/ BoJack Horseman (2020).
The lion in the AA meeting is named Leo. "Leo the lion" is an astrological sign covering the third week of July to a similar point in August.