Continuity mistake: After Esther suffocates Daniel in the hospital, Kate slaps Esther in the face. The hospital staff then hold down Kate and she drops her iPhone, screen down. The iPhone starts ringing, even though the screen is facing the floor. In the next scene, it is still ringing, but with the screen facing upwards.
Continuity mistake: When Esther is in her room and you are seeing that she is not a little girl but in fact an adult, she takes her teeth out. They're the nice teeth covering her bad ones. However when she sets them down, you can see that they are the wrong teeth. She has taken her bad prop teeth out and set them down, when it should have been the nice ones. You can see right before she takes them out that her teeth look nice. When she sets them down they are the bad set.Moles1982
Question: Maybe I missed something, but how was Esther able to fool everyone practically all her life and hide the fact that she's a 33-year old sociopath? When Kate finally learns the truth by getting the phone call, they show a photo of the "real" Esther, so at least those records of her exist somewhere. How could the boarding school not have known her true identity?