- Acting for Two: Laura Bailey voices Trish and Asa the Nightmare Nurse.
- Fake Brit: One episode had Rachel Kimsey, an American voice actress, using a British accent for the flight attendant. The same goes for Trish, who's voiced by Laura Bailey.
- Playing Against Type: Rachel Kimsey voicing Angela is a far cry from her more wholesome, kid friendly role as Wonder Woman .
- Relationship Voice Actor: Chas and Angela are John Constantine and Wonder Woman.
- Role Reprise: Matt Ryan is back playing John Constantine and is the third media adaptation of the character to be played by him.
- Working Title: The title was originally just "Constantine", but on the premiere date the subtitle - "City of Demons" was revealed.
Trivia / Constantine: City of Demons