In the scene where Calculon blew his first attempt at getting back into "All My Circuits", Leela stands with one hand relaxed, and the other in a fist. This is a nod to the statue of Abraham Lincoln, in the Lincoln Memorial, which has the same posture, where one side of him wants peace, but the other is prepared for war.
Leela is reading a book titled Courageous Horses of the 18th Century.
Calculon first came online in Urbana, Illinois in 1997.