: Real-life investigators Maurice Grosse and Guy Lyon Playfair were never physically assaulted by "demonic" curtains or thrown across rooms as portrayed in the show.
: A major plot point in this episode is the spirit shifting its focus. While Janet originally channeled the grumpy "Bill," sister Margaret also begins speaking in a gravelly voice—a development that suggests the entity is moving from person to person.
: Desperate for a solution, a medium is brought in to cleanse the home. This visit marks a turning point where the overt activity begins to diminish, though the emotional scars remain. Fact vs. Fiction in the Finale
The series takes creative liberties to heighten the horror, diverging from the historical records maintained by the Society for Psychical Research (SPR):
: The finale underscores the "horror" of the adults' reactions. By treating 11-year-old Janet as a "specimen" to be recorded and interrogated, they may have exacerbated a mental health crisis.
: While the show portrays the spirit of Bill Wilkins as a central antagonist, skeptics and later psychological analysts suggest the children may have learned about the man (who did die in the house) from neighbors and used the "voice" as a way to gain attention or cope with their parents' divorce.