The writer and director are fans of Steven Spielberg's Jurassic Park and the character Carl Hammond's last name was a nod to one of the characters in that film, and so was his not liking kids.
The river and cemetery scenes are nods to Greek mythology.
While filming the cemetery scene, a take had to be stopped when ghost hunters walked onto set asking loudly if the production team was from the TV show Ghost Hunters or Sightings.
Due to National Security issues, the main gate at Ft. Carson could not be filmed as originally planned, but the production team was allowed to shoot all around it on base.
The writer has first-hand knowledge of the effects of PTSD and suffers from it herself as well as some of the crew that suffered from Combat-related PTSD.