The first proposed plot line for this episode featured a backward time traveler that moved and spoke backward. It would have eventually been revealed that the time traveler was Fry and Leela's son.
The original title for this episode was "Frynority Report."
There is an extended reference to quantum physicist Erwin Schrödinger and his famous "Schrödinger's Cat" experiment. The thought experiment, which deals with multiple and simultaneous realities in quantum mechanics, closely matches the plot of the episode.
Hattie Mcdoogal's last will and testament is titled "Last Will and Whatchacallit."