I'm guessing this was at least partly due to #Grexit (Greg's exit), unfortunately.

He's no longer of Shades of Blue, but I do get the impression that he likes to stay really busy with work. It's possible that he either booked the movies before CEG got renewed and they've had to write around him, or they had this planned and he booked movies to fill the gap in filming (they've had 4 seasons of…

According to a tweet by Jasika Nicole, it was in fact a homage to Community. Text of tweet: