Initially, this episode was going to have BoJack appear less so that the focus would remain on Princess Carolyn. The cardboard version of BoJack was written in as a compromise with Netflix.
On the bulletin board outside Princess Carolyn's office at Vigor, we see headshots of Mad Men stars John "Ham"m and Christina "Hen"dricks as anthropomorphized versions of the animals derived from their last names (fitting for an episode centered around PC's work-life balance and talent agency bustle).
The two dogs that bumped into each other at the grocery store in episode 2 can be seen dining in the booth next to Bojack, Dianne, and Mr. Peanutbutter in the first restaurant scene