Continuity: In the scene where Amy is telling her son to get ready before school, his TSUBASA CHRONICLES wall scroll changes to NEGIMA! in the shots with his mother in the mirror.

Factual error: In the last few minutes of the film when Ben realizes he is in the mirror-world and not his own, he crosses a street just before touching the mirror. If this was in fact a "mirror-world", the cars would be on the opposite side of the street, the drivers side would be on the right, and the street signs on the poles would also be reversed, none of which is the case.

Factual error: In the scene after the mirror-person rips the sister's jaw apart in the bathtub, the detective in the following scene drains the water from the tub by removing the drain plug. No detective would have done this, as there could be evidence of the cause of death and the murderer (if any), and they would drain the tub with buckets and sift through them to preserve anything they find.

Continuity: In the scene where Ben is taking the pills and has the conversation with his sister, she leaves and he takes a drink. When he raises his head and sees his distorted face and screams, his sister rushes in and when she leaves after getting screamed at, she begins to walk out and never touches the door. In the following shot of Ben getting up, the door is closed, with his sister never having touched it. Nor is there the sound of it closing.

Other: At the end of the film, when Ben is in the mirror world, all the writing on the police cars is backwards. However the word "Police" on the car's bonnet is also backwards. Since in the regular world this is already written backwards to be read from a car's rear view mirror, this word should appear written normally.

Revealing: When Ben is at the morgue seeing Angela, he is holding her hand. When he lets go of her hand you can see her moving her fingers.

Other: In the scene where the mirror cuts his hand, Ben touches the mirror with his left hand. In the very next shot he is holding the flashlight with his left, pointing on his wounded right hand. Right after that he switch hands again.