The series 'The Watcher' likely takes some creative liberties. In the true story, the events might have been more straightforward, but in the show, they might have enhanced the spooky factor. They may have changed the timelines a bit to build more suspense. Also, the true story probably had a lot of details that didn't make it into the series, and vice versa. For instance, the real family's day - to - day reactions might have been different from how they are portrayed in the series.
One main difference is that the series is a fictionalized account, so it has to be more entertaining. In the true story, there were probably a lot of mundane aspects that were left out of the series. The series might have over - emphasized certain elements like the appearance of the house or the neighborhood to create a more atmospheric feel. Also, the characters in the series may be composites or exaggerated versions of the real people involved in the true story. And the dialogue in the series is most likely made up, while in the real story, we can only assume what was actually said during those disturbing events.