On the wall of Nick Birch's bedroom, there is a poster for "Disclosure: The Musical". The character starred in the ultimately canceled musical back in season 3.
Jay gives to DJ Coach Steve an "Anna Kendrick's cups" single. In I F**king Hate You (2021) Lola says to the ghost of Duke Ellington, while she was living with Jay in the Birch's attic, that only Cups by Anna Kendrick is allowed in the house.