Conceptualized and written under the title "The Night Nanny."
Olivia's therapist, Dr. Sheridan, shares a name with the therapist from the horror short He Drinks (2018). Both He Drinks and The Twisted Nanny were written by Michael Varrati, who has confirmed that the link is intentional. However, even though the character is played by different actors in each film, it remains unclear if it's supposed to be the same Dr. Sheridan.