Continuity mistake: When the kid's mother puts her hand against the glass and steps back, she gets hit by the car and just AFTER she is hit, the brakes are applied. Then when they switch to when Ed is driving the lady, he slams the brakes on BEFORE she is hit, as if he saw her first.
Plot hole: When the innkeeper is asked by the rich ex-actress to give her the key to a nice room, he gives her a key telling her that eight is cozy and the key has an 8 on it as well. But a few minutes later, when this woman is about to be murdered, she leaves her room (holding her mobile phone) and the door has a 9 on it. How can a key to the room 8 open the door of the room 9? [Still a mistake, but there's an explanation. In the DVD extras you can see a deleted scene in which she changes rooms because she wasn't happy with 8.]
Continuity mistake: In the first minute or so of the first scene, the doctor, played by Alfred Molina, is writing notes about his patient. He writes the word evil. The movie shows ev connected as in a lazy type of cursive from the left side of the doctors hand, then switches to a view from the right of his hand. The ev is now unconnected written in non-cursive writing.
Continuity mistake: At the beginning, just after Ed has hit the woman, he gets out to help and the husband is lying down next to her. When he says to Ed, "What have you done," his left hand is on Ed's jacket then puts it down to his wife, but in the next shot it is back tugging on Ed's jacket.
Continuity mistake: In the middle of the film just after Ed walks outside after taking photos of the dead husband, he calls Rhodes, then spots Larry across the way. Watch closely in one shot, we see Ed pass Rhodes, and in the very next shot he is some distance from Rhodes having just passed him in the previous shot.
Factual error: The prisoner is described as carrying an "Axis IV Dissociative Disorder"; that is complete nonsense - dissociative disorders are placed on Axis I in psychiatric diagnoses (Axis I is clinically treatable disorders; Axis II is mental retardation/personality disorders; Axis III is concomitant health problems (e.g., hypertension, diabetes mellitus, CABG, etc.); Axis IV is a list of psychosocial stressors and their severity (e.g., "Moderate - Health problems, financial problems"); Axis V is the GAF score (Global Assessment of Function, scored from 0 - 100). *Any* clinical professional with psychiatric experience would put dissociative disorder on Axis I except for the psychiatrist in the film, who apparently doesn't know any better.
Continuity mistake: When Ed breaks the limo window with a crowbar to get the phone from the actress, Ed runs and picks it up in his left hand, but in the next shot it is in his right. Also, when he smashes the window, there is a small piece of glass at the top and a very jagged bit left at the bottom from Ed's POV, when it cuts to inside the limo they are gone. He also reaches inside the car twice.