Continuity mistake: At The End of the episode, a screen shot of Nicki occurs. A day or so earlier, she had been kidnapped and pistol whipped across the face. But this screen shot shows no bruises or swelling or anything, despite being hit so hard she fell over in a chair just a day or so before. (00:40:00)

Blue Bloods (2010)
1 mistake in Down the Rabbit Hole
Starring: Tom Selleck, Bridget Moynahan, Donnie Wahlberg, Len Cariou, Will Estes
Frank Reagan: And I don't have a Teflon suit. Everything gets to me. Every time one of ours is hurt, or jammed up, or he's in over his head, it gets to me. I just don't show it, 'cause I can't show it, 'cause nobody wants, or needs, a sensitive police commissioner.
Sid Gormley: OK.
Frank Reagan: So screw you!
Sid Gormley: Yes, sir. That an order, too?
Frank Reagan: Yeah, that's an order.
Sid Gormley: Screw me. I'm on it, boss.
Trivia: In episode 2x1 "Mercy" the last scene was filmed at Brooklyn's Valentino Pier (it's also known as Coffey Street Pier) in Red Hook. It had been renamed for a Brooklyn firefighter who heroically died in the line of duty, and the area's full name is Louis Valentino Jr Park and Pier. It's an appreciated green area in the middle of a lot of buildings. Bit of trivia to add, Valentino Pier is featured in a short video with Rosie Perez.
Question: What is the significance of the lapel pin worn by detectives on Blue Bloods?
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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?
But why would the mayor wear one?