Continuity mistake: At the beginning of the movie, when Ana is escaping from her husband, she crashes into the bath and in the process pulls down the shower curtain and rail. The shot from above shows the curtain rail landing on top of her, but when the shot immediately switches to show to show a close up of her sitting in the bath, the rail appears to be propped up just behind her right shoulder.
Revealing mistake: As Ana is driving away from her home, when we see her car driving from a shot high above, we see a car crashing in to a gas station making a huge explosion. However the trees a few feet away from the explosion don't move. The shockwave would have made them react at least a bit.