It is revealed that Gina and Jake grew up together. In real life, Chelsea Peretti and Andy Samberg did in fact grow up together.
At one point, Jake Peralta tries to explain that he didn't receive any of the co-op board's 15 voicemails because he is 33 and his generation mainly only texts. Mr. Henders responds that he himself is only 31. At the time, Brian Huskey (who plays Mr. Henders) was in fact 45 years old.
Loan shark Frank Spond works at the office of Frank Del Tredici & Associates. One of the show's executive/co-executive producers is Luke Del Tredici.
The whiskey bottle on the loan shark's desk is labeled "Old Crow Crotch "
First appearance or suggestion of a "weekend crew," despite the main characters having worked weekends before, most notably in 48 Hours (2013).