Corrected entry: The New York City Police Commissioner wears a four star rank insignia on his collars, badge and lapel pin. The actual insignia worn by the police commissioner is five stars.

Blue Bloods (2010)
1 corrected entry in show generally
Starring: Tom Selleck, Bridget Moynahan, Donnie Wahlberg, Len Cariou, Will Estes
Character mistake: Sergeant Gormley is promoted to Lieutenant in the previous episode. In this episode he is referred to as Sergeant Gormley by Commissioner Reagan and Deputy Commissioner Garrett Moore at least twice.
Frank Reagan: I'm the PC. I know everything.
Trivia: Although Len Cariou plays Tom Selleck's father, he's only five years older than Selleck.
Question: What is the pin Mayor Dutton is wearing?
Answer: The Seal of the City of New York.
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Correction: The Commissioner is not a sworn police officer and wears no insignia. The four stars worn by both Frank and Henry Reagan reference their final positions as sworn police officers prior to being appointed Commissioner. As such, they are entitled to wear their final rank of insignia, which in both cases, was Chief of the Department, which is four stars. If one or the other had been appointed Commissioner at the time they were a two star Assistant Chief, then two stars is what they would wear on their dress blues.