Continuity mistake: Ruth Deaver is helping Alan Pangborn put on his tie. The camera is facing Ruth's back and we see Alan's face in the mirror. The camera then switches angles to face Alan's back and Ruth's face. Alan's collar which was popped straight up from the first angle is now perfectly down over his newly tied tie from the second angle. (00:24:55)
Chapter Two: The Dark Baptism - S1-E2
Continuity mistake: When Sabrina is about to sign the book with her blood, the drop of blood keeps changing where it's at. At first it hits a drawn line, then it's above the drawn line and is right below the last name. In the third shot, there is now a line space between it and the last name in the book. It continues to change depending on the camera angle.
Continuity mistake: Just before Olivia commits suicide by falling from the staircase balcony, we see her behind the railing. How does she suddenly get in front of the railing (which would need to happen in order for her to fall) just as the ghost of Poppy reaches for her? (00:52:15 - 00:53:00)
Continuity mistake: The crossbow at the bottom of the bed disappears and reappears throughout the movie.