20 Mind-Blowing Facts You Never Knew About Futurama
14. Grover Cleveland Has Two Heads
It's a background appearance that only the most eagle eyed fan would have noticed (and even then would have been chalked up as an animation mistake): when Fry and Bender hide in the Head Museum's Hall Of Presidents all the major POTUS get an head upgrade, but oddly enough Grover Cleveland pops up twice. You'd expect better from a show that just moments before went to effort to state the correct day of the week for 31st December 2999 (it's a Tuesday).
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Turns out this isn't the animators slipping up, but the creators hiding a smart, non-sci-fi pun in the background. Cleveland served two, non-consecutive terms, so he has a head for each time he was in office. Seems legit.