While playing Pictionary with Rosa and her parents Jake draws on the board. At the last shot of Jake, the drawing on the board is missing a part, a circle shape in the upper left corner that was there in the previous shot. It's something he couldn't have erased because he was using a marker on paper.
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.
The $18 coffee that Jake brings Rosa is clearly empty.
Rosa never allows members of the squad to know where she lives and moves apartments if she ever has to bring one or more of them there. Here, the squad shows up to her apartment unannounced and she is unperturbed.
The squad insists that Gina is the only one who can scare the cyber crimes unit into restoring their internet. While Gina is more manipulative and has fewer scruples, Rosa is the scary one on the team, not Gina.