The cashier at the grocery store is played by the Courtney Whitmore/Stargirl stunt double Kristina Baskett.
Sylvester reads a file titled Justice Society of America: Classified. JSA: CLASSIFIED was a DC Comics series written by Geoff Johns
At the beginning of the episode, when Sylvester gets out his car, an advertisement for "Community Coffee" can be seen behind him. Joel McHale, who plays Sylvester, famously played Jeff Winger on the sitcom, Community (2009).