The homeopathic doctor hosed by the Civil Defense truck holds a degree from Evergreen State College, Matt Groening's alma mater. This college is out of Washington State, and this college is always picked on for not being a credible college by all the colleges within Washington State.
In the first scene, Fry, who is inexplicably wearing a wool cap despite the extreme heat, is briefly seen pulling his underwear out of his pants, then stuffing them, along with his hands, back down his pants with a smug look on his face. There is a deleted scene in the DVD special features where Fry explains that he soaked his blue wool cap and red wool underwear in water, then put them in the freezer to make them cold. What's left of the scene only shows him wearing the cap and stuffing his underwear back into his pants.
The short film, 'Global Warming, or None Like It Hot!" appeared in Al Gore's documentary An Inconvenient Truth (2006) on the effects of global warming.
The "Curious Pussycat" sign in Kyoto translates to "I love you more than your mother does".
This is the first appearance of Hedonism Bot.