When Todd presents the fire in Yesterdayland, "Gabe Jr., the Grease Fire of the Caribbean," this is a callback to Later (2014) when Todd argues with Bojack that fires can be called things like the Chicago Fire or Gabe - "Just a fire I met once. Named him Gabe."
This was released on the 60th anniversary of Disneyland's opening day.
When Mr. Peanutbutter is visiting the doctor, there is a poster at the wall saying : "Ask your doctor if neutering is for you." Two tennis balls are visible in the upper left corner of it.
Todd has a bottle of Alpine Sweat on the coffee table. This parodies the real-life soft drink Mountain Dew.
Todd has a box of Mice Krispies cereal on the coffee table. This parodies real-life breakfast cereal Rice Krispies.