The Uniform - S2-E11
Character mistake: While handcuffing an auxiliary officer in his apartment, there is a poster on the wall reading, "attention military personal..." Personal is misused. It should read "attention military personnel." (00:16:02)
Continuity mistake: During the stakeout of the apartment building, in the exterior shots of the Clyde Motorcycles shop, Danny is peeking out through a ripped paper opening within the letter "D" in Clyde. However, in the interior shots the black tape letters of the word Clyde differs. The paper is ripped between the two letters "D" and "E" and that space within the "D" is blocked with molding, making what is in the exterior shots quite impossible. (00:15:40)
Super Grover
Continuity mistake: While Danny and Baez are questioning Damian about Mason's whereabouts, Damian's right handcuff switches to the opposite way depending on the angle of the shots. Either the single metal bar faces up or the double bar faces up, which is quite impossible to change when it's locked around his wrist.
Super Grover 
Visible crew/equipment: When Eddie and Jamie stop to help the woman holding the boy, in the exterior shot as Jamie gets into the back of the RMP with the young boy, the reflection of camera equipment is visible on the window. (00:04:55)
Super Grover 
Visible crew/equipment: After Anthony drives the Porsche 911 into the garage, in the shot facing Erin and Anthony just as Jimmy gets into the car, the green T-mark, the red tape mark, and blue tape mark are visible on the floor.
Super Grover 
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).
Bishop73What about the other flag that is not the U.S. flag?
Please be more specific. Are you talking about the New York City flag?
Bishop73It 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