The movie poster for the Black Echo movie within the show resembles the cover of the Harry Bosch novel of the same name.
LAPD Code 37 at 00:04:43 is a "Possible Stolen Vehicle".
Robbie Jones, who plays Officer George Irving is only 15 years younger than Lance Reddick (plays his father Irvin Irving) and 8 years younger than Erika Alexander (Connie Irving)
Although they don't share any scenes, this episode reunites former "ER" stars Troy Davis and Abraham Benrubi. Davis played Frank Martin and Benrubi was Jerry Marcovic. Both were ward clerks in the emergency room featured in the series.