Continuity mistake: When Danny/ Baez and Jamie go to arrest the medic, there are a few different shots where there is snow on the ground and then none, likewise no snow on cars and then a lot. (00:08:00)
Visible crew/equipment: Towards The End of the episode as ADA Reagan is walking to her car, you can see the cones in the DAR end of the street the filming crews used for traffic control to keep traffic off the set. (00:02:30)
Answer: It is the lapel pin worn by members of the NYPD Honor Legion.
The lapel pin is on Danny but not Biaz, why? Also, Baker, Sid, Frank &Garrett wear one. Significance? Are they all the same?
Is the P.C.'s pin different than a legion pin? What are the symbols and their meaning?
I think it may be Masonic?
But why would the mayor wear one?