Trivia: Chris Pratt had planned to audition for the role of Chris Pratt, thinking he would land the role simply for having the same name as the character. However, he postponed the audition to go on a fishing trip, and by the time he had returned, Joseph Gordon-Levitt had been cast in the role.
Trivia: When Abe Dale comes into a room (possibly a church?) where the children's choir is singing, the song is Rush's Spirit Of Radio.
Trivia: Ben Murphy's parents in this film are actually John Krasinski's real-life parents.
Trivia: The future predator is based on the Purrip bat in Dougal Dixon's 'After man: A zoology of the future'.