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Revealing mistakes
When Hooker pulls into the wrecking yard, the number on the fender of his car is clearly a magnetic stick on decal.
When Hooker and Romano arrive at Capt. Medavoy's station to talk to him about their rogue cop suspicion, they are driving one of the Dodge St. Regis patrol cars. After the meeting, when they arrive back at their own station, they are now in an older Dodge Monaco patrol car.
While Hooker and Romano are discussing the .22 ammo seen in the other patrol car you can see a car with yellow emergency lights in the lane to their left, when you see Hooker's car from the rear, it is not seen.
In the chase scene in the junk yard the car Hooker is chasing are seen going by the same red pick up truck twice.
When Hooker pulls into the wrecking yard, the number on the fender of his car is clearly a magnetic stick on decal.
After they read about the hit man turning state's evidence, as the officers pull away the camera operator's head is reflected in the side glass of the police car.
When the initial murder is called in, Hooker and Romano are definitely the first police officers to arrive on the scene, and yet police tape is already strung.
Hooker discusses officers carrying a second gun while on duty. He errs in that one main reason they do so is in the event they are disarmed they will still have a means to defend themselves. This was common practice among officers in the 80's so it was something he would have known about. In a related character error, Hooker comments he does not like snub nose revolvers as they do not do much for accuracy. While off duty, Hooker always used a snub nose revolver.