The real-life Broaddus family (the inspiration for the Brannocks) reportedly remained a united front. The subplot of Nora suspecting Dean of being "The Watcher" was created for dramatic tension.
In real life, there were no secret tunnels found under 657 Boulevard. The Watcher s01e05
Nora becomes convinced that Dean is the one writing the letters to scare the family into selling the house, especially after discovering his financial struggles and a mysterious video of a girl with pigtails in their bedroom. The real-life Broaddus family (the inspiration for the
Real-world investigators did find female DNA on one envelope, but it did not lead to an arrest or a breakthrough in the case. Deep Dive Resources Nora becomes convinced that Dean is the one
The episode ends with the contractors discovering a hidden, Prohibition-era tunnel in the basement. Dean and Nora find evidence that someone has been living there, and the episode closes with them chasing a mysterious figure through the passage.