There are a number of scenes which indicate that the show is actually shot in Los Angeles and not New York, where the show is supposed to take place. There are several supposed one way streets with double yellow lines painted down the middle (which do not exist in New York), large blue street signs (which are used in LA, as opposed to NY, which uses green street signs), and house numbers on each street painted into the sidewalk in front of each house, which is also not done in New York, but instead in Los Angeles.
In more than one instance, suspects being interviewed with a polygraph answer all the control questions (Is your name John Doe? Are you 39?) truthfully. In reality, a suspect is told to answer all the control questions "yes", whether true or not, to determine the accuracy of the polygraph machine.