Naomi Watts (voiced by herself) is BoJack's costar in Mr. Peanutbutter's Hollywoo Heist. She plays the role of Diane in the film based on BoJack stealing the Hollywood D for Diane, which Mr. Peanutbutter takes credit for.
Wallace Shawn (voiced by himself) is BoJack's costar in Mr. Peanutbutter's Hollywoo Heist. He plays the role of BoJack in the film. He appears in One Trick Pony.
Ira Glass (voiced by himself) provides the voice of Diane's ringtone, which parodies his radio show This American Life.
Derek Jeter tries to help an old woman across the street in Live Fast, Diane Nguyen, but when they're struck by a barrel of chum, he runs off with her purse.
Matthew Fox, a wolf, presents an award alongside Scott Wolf, a fox, at the 1994 Animal Choice Awards during Hank After Dark.
J.D. Salinger is an author and the producer of HSAC!WDTK?DTKT??LFO!After faking his own death, he worked anonymously at Joe Nobody's Shop For Tandem Bicycles until he was re-discovered by Princess Carolyn.
Truman Capote is a member of the Ghost Writer Con panel in Downer Ending. Capote has been famously rumored to be the actual author of his friend Harper Lee's novel, To Kill a Mockingbird.
Hilary Swank is on stage with Mr. Peanutbutter to present the Golden Globe to BoJack in Later. Works in Manatee Fair.
Characters from the Netflix series Orange is the New Black can briefly be seen in prison with character actress Margo Martindale during Later.
McGruff the Crime Dog can be seen sniffing around the crime scene in Chickens. McGruff was a part of a popular ad campaign in the 80s and 90s used to build crime awareness among children.
Baby Sinclair, a puppet from the TV show Dinosaurs, can be seen thrown out by a dumpster in Still Broken.
