Early in the episode, Rudy brings up Theo's antics from the series Pilot episode and the season three episode "Bald and Beautiful".
This episode features two subtle references to black history: Theo says that he went to Benjamin Banneker bank.
Banneker was a famed African-American inventor. Also, the name of the group of students that Theo is teaching is called the "Rosa Parks group." This is a tribute to the legendary civil rights icon.