The Zoe vs Zelda reference is based on a blog post creator Raphael Bob-Waksberg wrote about Tia and Tamara Mowry from the TV show "Sister Sister"
Angelyne Billboards can be seen outside of the diner when Bojack and Todd have lunch a throwback to her famous 1984 Billboard campaign.
The photographer Diane Arbus is mentioned in this episode, but her first name is mispronounced by the characters. Ms. Arbus pronounced her first name DEE-ann, not the more common DYE-ann.
One of the creators of Mr Peanutbutter's house is David Chase, also the creator of The Sopranos