Mark Wahlberg admitted that he regrets working on this movie, but said, "You can't blame me for wanting to try to play a science teacher. At least I wasn't playing a cop or a crook."
The movie was shot completely in sequence.
The DVD also contains a deleted scene of a piano recital that suddenly becomes tragic (captured on cellphone video), and extended, more gruesome versions of the lion attack and porch shooting scenes.
M. Night Shyamalan: The voice of "Joey," who calls Alma a few times throughout the movie. The audience never sees him nor learns of his fate.