Gina returns to the precinct to teach Holt her filing system, which Holt describes as "just a big pile of loose papers" with "no dividers." Gina confirms this assessment. In Chocolate Milk (2014) it was established that she files according to "perp hotness."
When Gina and Jake are at the Manhattan Social Club and Gina fake calls their "daddy" at reception to get them in, the first shot of Jake taking the phone from Gina, it is clearly the home screen on the phone. However, the phone screen changes to a call screen in the second shot after it cuts away.
Santiago is wearing two citation bars that are not issued by the NYPD.
As proof that crystals work, Gina states that the bus that hit her in The Fugitive, Part 2 (2017) was going 60 miles per hour and the impact should have killed her. The bus that hit her was not traveling anywhere near 60 mph, nor could it have been on a New York city street, given posted road speeds and traffic.
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.