The day before this episode aired the series was canceled by the streaming service.
In the DC comics universe, Danny Cassidy is a stunt actor who was fused to his Blue Devil costume by demonic energies. The occult nature of his origins and his association with the Shadowpact overlaps with some of the same characters as the Swamp Thing and Justice League Dark.
Dr. Jason Woodrue in the comics is also known as the Floronic Man and an adversary to Swamp Thing.
Maria calls Madame Xanadu "Nimue". In the comics, Xanadu is identified as the sorceress Nimue Inwudu from Arthurian mythology. Xanadu is a long-standing comic book character, having first appeared in 1978. In the modern day Xanadu can sense mystical phenomena and uses Tarot card to interpret what she senses, and is ageless due to a deal she made with Death.
The episode was reaired as the CW Premiere airing, on 10/13/2020.