The closing credits song, "Done The Math," was written by actor Hugh Dillon (who plays Adam Westinghouse) and performed by his musical group Headstones.
When Noah Kross is asked if he's a family man, he responds that he's trying to be. Nicholas Cage previously played in a movie called Family Man.
The sound effect used for the opening and closing of Noah Kross's phone, is the same sound effect used for the cloak power up in most of the Halo games.
This movie has many similarities to various Philip K. Dick stories, including the title, though no credit is given, even for the typical "inspired by".
Cage's character name is Noah Kross. John Hustons' character in Chinatown (1974) shared the same name (spelt Cross). Water or lack thereof was integral to both films.
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