The Jazzercise studio Diaz, Peralta, and Holt are seen talking in is called Razzmatazz which is the name of the horse Holt is betting on in his flashback during USPIS (2014).
Pimento complains that his private detective gig is suffering in part because of poor Yelp! reviews, including at least one saying he has a "weird energy." Later, Rosa - to whom Pimento is engaged - describes him to Lt. Hawkins as "good looking guy, weird energy."
Chelsea Peretti's late term pregnancy is finally acknowledged on screen, creating a strange situation in which a group of the NYPD's finest detectives come to the conclusion that a woman who has been visibly showing for months may be pregnant.