![Blue Bloods mistake picture](/images/screenshots/309000-309999/309965_sm.jpg)
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.
Answer: The Seal of the City of New York.