When Detective Seo Tae-Yoon's gun is tossed away from his hands by Park Hyeon-gyu, the gun is seen landing to the left of the train tracks from the camera's point of view. Moments later, when the detective returns to pick it up, the gun is seen lying on the train tracks itself.
In the letter received from the FBI written in English, there are four spelling mistakes - 'examnation' instead of 'examination', 'insrumental' instead of 'instrumental', 'dateed' instead of 'dated' and 'Octorber' instead of 'October'.
When the last victim is shown on screen (still at the murder scene under torrential rain), when the Crimen Scene Investigators are moving her head, her eyelids slightly twitch twice in a way only a living person would.
When Detective Park shows murder suspect Kwang-ho a picture of the footprint in the dirt, Park is also holding a right foot sneaker that matches the print in the picture. However, the footprint in the picture would have been made by a left foot sneaker. The print and the correct shoe making it would have been reverse images of each other.
While the corpse in the medical room is having peaches removed from her, the camera moves to her face and neck, and you can see the actress's heartbeat in her neck.
The letter from the FBI about the semen DNA testing is signed by director Clarence M. Kelly. Kelly was director from 1973-1978. William H. Webster was director in 1986.
Several characters are seen wearing white iPod-style earbuds. Earbuds of this style did not exist before 2001.
When the detectives get the stalled car started by pushing it up the road, the sound effect is of an engine being cranked normally, i.e., by an electric starter.
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