Mr. Peanutbutter mentions that "Michael Vick made me a very strange offer." This is a reference to a scandal from 2007 in which Vick and four other men were convicted for dog fighting.
During the first scene featuring 2007 Todd, a mouse in a Stanford hoodie makes a cameo. This is Mia McKibbin, the associate producer from Let's Find Out (2015).
At the John Edwards fundraiser, there's a giant anteater eating the arm of a giant ant.
When walking on the studio lot, BoJack, Princess Carolyn, and the producer walk past a sign next to a red light that reads "When red light is on, we are definitely not in the middle of something, Derek!"