When Kojak is chasing a suspect in a car, the rotary beacon is mounted on the right hand side of the roof (and the passenger can be seen reaching out to prevent the beacon from falling off due to the manoevering of the vehicle). Immediately thereafter, the beacon is suddenly mounted on the left hand side of the roof.
In the last act the police headquarters is shown, but the building is Parker Center, the HQ for the LAPD in Los Angeles, CA, not the NYPD in New York City.