Throughout the seasons Bender has admitted to being forty percent titanium, forty percent scrap metal, forty percent dolomite, forty percent wire, and forty percent luck. Also, the third world workers in season six, episode three, "Attack of the Killer App" say he is forty percent chromium. Not to mention season seven, episode seventeen, "Forty Percent Leadbelly".
You know the worst thing about being a slave? They make you work, but don't pay you or let you go.
Turanga Leela: That's the only thing about being a slave.
In many episodes the Earth's knowledge of things that have happened in the past is lacking, due to an apparent loss of historical documents throughout time (for example, in Season 1 Episode 2 "The Series Has Landed" it is made clear humans don't know the exact details of the first moon landing, or in Season 5 Episode 2 "Jurassic Bark" it is unclear how a 20th century pizzeria operated,) yet many people from Fry's time period are still alive, such as Richard Nixon or Leonard Nimoy's head. Also, even though characters do not know the details of important events in or before the 20th century, many characters make references to popular songs of the past (William Shatner in Season 4 Episode 12 "Where No Fan Has Gone Before", Kif in Season 3 Episode 5 "Amazon Women In The Mood".)
The production company logo shown at the very end of the show is "30th Century Fox".
Originally, one episode had a scene where Fry pulls down his pants and moons the business magnate Mom (of Mom's Friendly Robots). Her original dialogue was, "You call that an anus?", but it only appeared in closed captioning and was redubbed with "You call that a pressed ham?".