Continuity mistake: The skull on the Killwithme website is an x-ray of Owen's father's head. In the movie, it was mentioned that the glasses were found on the roof by an employee, and was sold on some website. Why would the x-ray have the glasses on the face of the skull if they were not with the corpse?
Continuity mistake: When the detective and police arrive at Mrs. Miller's boat, you can see a group of reporters in front of her door. The woman with blond hair changes her dictaphone to a microphone between shots (she also moves between scenes from just in front of the door to one side and to a few feet away from the doors). And the whole group of reporters changes its position between shots.