The City That Never Sleeps - S4-E2
Continuity mistake: Danny and his partner are driving with a passenger in the back seat. You can see both front seat headrests removed while they are talking in the car. Next shot shows the car from outside and you can see the headrests are on the seats.
Answer: It's the New York Police Department flag, created in 1919. The stripes represent the 5 boroughs and the stars the different towns that made up New York (including New York City itself).
Bishop73
What about the other flag that is not the U.S. flag?
Please be more specific. Are you talking about the New York City flag?
Bishop73
It is the Iowa State flag. At least in the episode from 1/22/21.
It wouldn't be the Iowa State flag. Plus the Iowa State flag is blue, white, and red. The flag I think they're talking about is blue, white, and orange.
Bishop73