Corrected entry: The film is set in 1977. There is a scene where the radio is playing 1010 WINS and the announcer comes on and says "1010 WINS, you give us 22 minutes, we'll give you the world!" When 1010 WINS first started, they used to say, "You give us 10 minutes, we'll give you the world!" They didn't start saying 22 minutes until the 80s.
Corrected entry: When the 44' killer has been found out, it was mainly due to a witness seeing him drive off with a parking ticket on his windscreen. Earlier in the film (in the scene where he is contemplating killing the police officer) he removed the ticket in full view of the camera and put it inside his car.