Bree/Abel's cardigan is patterned in bees, which in Greek and other mythologies are associated with death, the Underworld, and reincarnation.
Towards the end of the episode, Lucifer says he had the perfect title name for the sequel to The Plunge 2, "2 Deep 2 Plunge." This is a play on The Fast and the Furious (2001) sequel, 2 Fast 2 Furious (2003).
Subtle angel+wings reference, and an indication of someone (God, or the production designers) quietly messing with Lucifer: a sign on the hospital shows it is called Saint Angeline Memorial Hospital, with a logo depicting a winged and haloed angel. Angeline means "angel" or "messenger" (As an aside: Saint Angeline is the patron saint of service).
Episode title spoken by Lucifer.