When Jake and Holt are in the van, Jake's fake mustache is straight. When he enters the diner, his mustache curves along his upper lip.
When Jake, Holt, and Gordon are talking in Holt's office, Jake's arms go from being folded to having his hands on his hips to folded again between shots.
A burning plastic bag filled with personal belongings made from all kinds of synthetic materials would emit black smoke, which is not present when Diaz shoots the arrow at the pile.
Santiago is wearing two citation bars that are not issued by the NYPD.
Amy says she wishes to be featured as "organizer of the month" in a magazine called "Organizer's Quarterly." A magazine that is published quarterly (every 3 months) would not have a monthly feature.
NYPD regulations require that Amy Santiago is not wearing the American Flag bar as the highest citation bar the highest as is required by NYPD regulations.
Captain Holt wears his Commendation breast bar above his World Trade Center Breast Bar. When the WTC bar is worn, it is worn above all other medals but below the American Flag bar.