Callback to Deceptive Little Parasite (2017), where Ella says she is in therapy because she has "a lot of darkness" inside. Ella has also claimed to be able to sense light or dark in other characters (Mum and Charlotte, in particular). The killer tells Ella he senses her inner darkness.
This is the second episode of the series to be directed by Kevin Alejandro (Dan Espinoza). The first was Once Upon a Time (2018).
The paper that falls against the electrical outlet contains a list of high quality vintage cameras.
The snake that Lucifer brings to the police station is the nonpoisonous Scarlet King Snake that is often mistaken for the venomous Coral Snake that has the same tri-color rings of red, black, and white/yellow but in a different order.
Another difference between Michael and Lucifer is revealed: Lucifer is cavalier about money, while Michael is miserly. ("Hey! That was, like, seven bucks!")