Amy's dad mentions that Jake is not allowed within 500 feet of Taylor Swift. This was first referenced in Coral Palms, Part 2 (2016) in which Jake tells Captain Holt that he was once arrested/detained at a Taylor Swift concert.
When Boyle comes out dressed in plastic, he says he feels like Dexter. Jimmy Smits, who plays Amy's father, also guest starred in season 3 of Dexter (2006) as ADA Miguel Prado.