When William was reading the newspaper, the sentences on that page were repeated.
When Bill Harford read the newspaper report about drug overdose, the headline drugs overdose was a British usage, not an American usage drug overdose.
Continuity: When the woman wearing the mask and the other man wearing the mask walk towards Bill Harford, the woman's hair initially covers the forehead, but in the next shot, the hair runs to the back.
Continuity: When Bill Harford was walking into Marion’s room, we could see two carved tables in the hallway; and when Karl arrived a few minutes later, the carvings on the first table disappeared .
Continuity: When Bill Harford is at the prostitute and Alice calls him, the number of cookies in the box in front of Alice is 5 in the previous shot and 6 in the next shot.
Continuity: Bill Harford walked into a restaurant when he noticed being followed. From the outside of the restaurant, the street where the restaurant is located is completely deserted; but from the inside of the restaurant, you can see that there are many pedestrians on the street.
Geographical error: There are many British road signs throughout the film that continuously break the New York illusion created by inadvertently revealing the filming location.
