Continuity mistake: When Rachel goes in to Max's bathroom, all the water falls down from the ceiling drenching everything, but then Max comes in, and takes a dry brown towel off the rail to wrap around Aidan. Also, the white towels behind them are bone dry too.
Audio problem: When the deer are all grunting at Rachel and Aidan, the whistle of an elk can be heard despite the fact there are no elk in the scene.
Visible crew/equipment: When Rachel starts to climb out of the well water onto the well wall, in the closeup of her left side as she lifts herself out of the water, a long white cord/wire hangs straight down her left side from her shirt to her pants.
Continuity mistake: When Rachel is in the basement looking through the book and sees the newspaper article, if you pause the film when the article appears close up, you can read some of the article. This article has nothing to do with the title and photo caption above it, about the young girl in the bathtub, it appears to be about something political. The filmmakers assumed the article would flash by too fast for the viewer to read.
Continuity mistake: When Rachel begins to brake her car after seeing the deer on the road, as the shots keep changing the markings on the road also keep changing. In overhead shots the markings are a single broken yellow line, but in closeups of the wheels, the markings are solid double yellow lines.
Continuity mistake: When Rachel pulls up to the old Morgan house she parks her vehicle on the gravel drive, angled into some tall grass. Yet when she leaves the house with the book, the vehicle is now parked halfway on the main road and is no longer angled (but is now much straighter) and is not facing any tall grass.
Continuity mistake: When Rachel has the dream of Aidan telling her to kill him, there is a shot where Rachel looks as if she is about to stroke his face, and the next shot her hand is not on Aidan.
Continuity mistake: Near the beginning, Hayden is sitting at the desk in his room and his shirt collar is wide open. His neck shows, but that's it. A moment later, when he leaves his room, and comes into the Kitchen, he wears a light grey t-shirt under the other shirt.