Most of the actors who surround Lawrence are amateurs tapped for their local authenticity. I didn't notice. The acting is fine from everyone, and especially so from Lawrence and John Hawkes. Everything seems authentic, though the movie is a Quest Narrative, about as long-standing a story structure as there is. The plot manages to avoid stereotypes in its depiction of its blighted rural areas and their impoverished residents.
There's an almost dystopic feel to the movie. One can see how the producers of The Hunger Games franchise, seeing this film, would think to cast Lawrence as the heroine of that series. But her quest here, grounded in horrifying reality, is a far more compelling journey through the night. Highly recommended.