Character mistake: When Gustav Briegleb confronts J.J. Jones demanding to know where she was, he states that her 'neighbours' saw her being taken away. In fact, she was taken to the asylum from the police station, not her home.

Factual error: Towards the end of the movie, Gordon Northcott is referred to as a "serial killer." This term was not coined and put into usage until the 1970's. From Wikipedia, it's "commonly attributed to former FBI Special Agent Robert Ressler in the 1970s. Serial killer entered the popular vernacular largely in part to the widely publicized crimes of Ted Bundy and David Berkowitz in the middle years of that decade."

Continuity: When the "substitute" boy gets off the train he is with an older women. The reporters ask the mom and boy to take a picture together. You can see from the camera angle that the older woman is in the background when the flashes go off taking the picture. Later in the movie, the psychiatrist holds up a newspaper article with the picture in it. In the newspaper picture, the older woman is not in the background.

Continuity: When Angelina is sitting down at the table at the mental asylum, she is sitting across from a heavyset woman. Before she starts talking to the blond woman, the lady across from her takes a drink. Just as she is raising the glass, the scene cuts to another angle and the lady's glass is down on the table again.