A street scene is filmed in a courtyard of Cal Poly Pomona's administration building, the same one used for Jude Law's apartment building in Gattaca (1997). Several students and staff of Cal Poly Pomona were used as extras for this scene.
The adaptation of Philip K. Dick's short story "The Impostor" was originally planned to be one segment (about forty minutes) of a three-part science fiction movie. The production company liked the early "dailies" so much, that the idea was fleshed out into a feature length film. The other segments grew into the features Mimic (1997) and Alien Love Triangle (2008).
Originally intended to be Miramax's big Christmas movie for 2001, the film got delayed to January just days before it was set to open due to last-minute edits on Kate and Leopold (2001), which forced that film to take this film's original date.