When Lou Grover is telling the story about his Chicago P.D. training officer, the impression actor Chi McBride does sounds just like the late Dennis Farina, who was a Chicago P.D. officer for years before becoming an actor.
Michelle Hurd, who plays Grover's wife Renee, has TV cop experience as does Chi McBride, having played a detective on Law & Order: Special Victims Unit (1999) and a supervisory agent on The Glades (2010).
Performing an autopsy of sorts in the elevator, Dr. Mindy Shaw records "today's date" as "April 3, 2015", which is the episode's original air date.
Title translates 'Instinct'