What really bothered me (SPOILERS)
In the scene where the kid gets the bag over his head and is being sufficated, Paul tells Anna to take off her clothes or the kid will be hurt. Now after this, she stands there for around 30 seconds, in total horror of her son sufficating. Then, as the kid is screaming to the point of agony, THEN she decides to get undressed. It's almost like she was more concerned about her body being seen than her own son's life.
My friend whom I watched it with said the same thing. She also added if that were her in that situation, her clothes would've been off her in less than a second.
No spoilers today!!