Blooper

Climbing a tree to escape a bear is one of the worst things you can do. Not only are bears adept climbers, but once you get in the tree, you have nowhere else to go. The bear will have you cornered. An experienced hunter would know this.

Cal (Matt Bomer) tells David (Josh Wiggins) not to eat snow, as it takes more water to process snow into water, than the snow gives you, calling it a sure way to dehydration. This is incorrect. All one needs to process snow into virtually pure water, is heat, and very little of that, which the body readily provides. Eating frozen snow could, however, contribute to, or hasten hypothermia, especially in a state of compromised health, extreme cold, and diminished caloric intake.

Cal (or the screenwriter) may have confused eating snow with drinking seawater, which does take more water to process than it provides, to remove the salts, and will dehydrate a human body.