As with most fictional TV shows, actual NYPD patrol cars are not used during filming. The motto/logo shown on the rear passenger side door of the fictional NYPD cruiser reads "Honor, Service, Dignity." The actual motto/logo on the car doors is "Courtesy, Professionalism, Respect" or "CPR" for short.
When the security guard returns to the journalist to give her her press credentials he does not set off the magnetometer even though he's wearing a gun, radio and other metal accoutrements.
21:25: Jack tells Hastings that he is at 1145 West 18th Street. 699 is the highest number for the West side for most Manhattan crosstown streets.
President Hassan, a Muslim character played by Anil Kapoor (who is a Hindu) is shown wearing a Hindu ceremonial red thread on his right wrist.