When I first saw the hitchhiker at the beginning of the movie I thought, 'oh, cool. Dave Grohl is taking some time away from Foo Fighters and branching out into acting. I wish it had been the rock band's frontman. He could've been the secret axe murderer who is found out near the end is killing everyone with an electric guitar. The actor that actually played the drifter was a yawn at best. One dimensional. His character needed layers and wasn't given any. Not much onion to peel back.
Carmichael played the lead character and was able to give the role some texture. Once you get past the notion that this movie isn't a low budget T&A horror flick (no money in the budget for T&A), you then immerse yourself into what Carmichael's character is undertaking in her current adventure.
It didn't seem as if the LEOs (law enforcement officers) knew any cop procedures. I've watched countless hours of cop video on YouTube and these "TV" cops didn't seem realistic. I've watched perps fight with cops as handcuffs are being put on them. Sometimes it takes three or more cops to get cuffs on the criminal, even females.
Finally, I want to say the waitress gives the most authentic scream I've heard in a long time in a horror/thriller flick. Kudos to her.