Continuity mistake: In the scene where Adam visits Elsa in her room, Elsa makes tea. Adam starts to talk to her about destiny and she leans against the drawer behind her. Then it goes to the next shot when Adam mentions Polina. Then in the next shot, Elsa is standing right in front of him and is freaked and pours the boiling water on Adam's pants.
Continuity mistake: In the scene where the two men are trashing Alex's apartment for the second time there is a shot of Emma backed up against a wall. She has her hands up by her face and the sleeves of her shirt fully cover her arms. As the shots changes one of her sleeves is down by her elbow, in the next shot its back where it was. This happens a couple of times.
Continuity mistake: Throughout the movie, Emma is removing/putting on her glasses. At one point, Emma is shown from the front, no glasses. Then the camera goes to Alex, and Emma is shown from the back, but with glasses on. When the camera returns to Emma, she is without the glasses again.
Continuity mistake: In the beginning of the movie, it shows Emma with something on her forehead, a scratch, scar, etc. It looks like it had been tried to be covered with cover-up. But in the same shot you can see it dissapear over the course of about one/two seconds then it is completely gone. You can see the scar throughout the movie.