Jeff Keilholtz "Blaze" temporarily damaged veins in both hands when he punched the ground during the climatic scene.
Due to budgetary constraints, over fifty percent of the screenplay was scheduled to be filmed on top of a secluded cliff in West Virginia in only four days. The first day it rained, leaving only three days and two nights to film over 45 pages of script.
The screenplay was locked down through production. Actors were only given access to their parts of the script and were never told how their story tied into the whole. Some actors were only given their lines and the preceding four lines in the script. Some were not even given their scenes until the day of shoot.
The directors approached Will Saxton to do the score before filming began. Saxton then created tracks to be played for the filmmakers to use while filming. Throughout the 18 months of production, Saxton delivered over three and half hours of music before finding the final flavor of the score. The 30 track, 60 minute soundtrack, named after the five stages of grief plays as one continuous piece of music.
70 percent of the movie was shot outdoors and when an early snowfall covered the locations, it pushed back production almost a full year in order for the locations to regain continuity.