After Erin discovers that Coryna's mom was not her biological mother, Erin refers to her as her aunt. However , she told Erin that Coryna was her cousin's daughter. That would actually make her 2nd cousins, not her aunt.
Actor Esai Morales played on two episodes of Blue Bloods. Both credited as Sgt. Trey Delgado. The first episode "Backstabbers" and this one. However, he is a captain in this episode. It is uncertain if his character has the same name though (Trey Delgado).