Futurama Easter Egg - Bender's Big Score - the Futurama Time Logic Scribble

In Page 2 of the Special Features (accessible by choosing "Special Features" from the main menu, and "More" from the submenu), pressing the right navigational key until the etching of Bender's head is illuminated will allow access to Ken Keeler's and David X. Cohen's notes on keeping track of the various timeline shifts throughout the film.