Futurama Easter Egg - HS+MB

In said episode, when Fry and Leela enter the Inferno ride, it gives a shot from iside looking towards the door. In the lower right corner of the shot, you can see a pink heart with the initials HS+MB inside. That most likely stands for Homer Simpson and Marge Bouvier, from of course Matt G.'s other animated series "The Simpsons".