The doorbell tone on Flora's house is the Imperial March from Star Wars: Episode V - The Empire Strikes Back (1980).
Danny Pudi, Ben Schwartz, Bobby Moynihan, and Kate Micucci have all previously worked together on DuckTales (2017) providing the voices of Huey, Dewey, and Louie Duck and Webby Vanderquack, respectively. In Moynihan's first appearance in the comic book store, he can be seen reading a DuckTales comic book.
In one scene, Flora's father, George tells her he loves her, and Flora responds, "I love you 3000." This is the same thing Tony Stark's daughter says to him when he tucks her into bed in Avengers: Endgame (2019).
Bobby Moynihan's character is a comic book store owner named Stanlee, a tribute to Marvel's late creator, Stan Lee.
In his first appearance, the comic book store owner/manager character is wearing a "Mumford Phys. Ed. Dept." T-shirt. This is the shirt worn by Eddie Murphy as Axel Foley in Beverly Hills Cop (1984).