The final shot in this episode is framed exactly like a shot from Childish Gambino's (Donald Glover's music persona) "Sweatpants" music video. Both take place in a diner, are directed by Hiro Murai and of course, both star Donald Glover.
When Earn calls the bartender "Tiresias," he is referencing the oracle from Greek mythology of the same name, famous for clairvoyance and becoming a woman for seven years.