Factual error: The geography throughout the film is all wrong. The setting is in Pennsylvania, near Pittsburgh. The driving times between there and Williamsport are extremely under-estimated. Most egregious is the river structure. The body is found in the river near Sunbury. Not possible from a site in Western PA. Basically all relationships between actual towns/cities mentioned are totally wrong.
Audio problem: Isabelle, in the bathroom, turns the bath on, then proceeds to have a heart attack. Slowly people come in and help her take her pills. No-one goes near the bath, and yet the sound of the running water is no longer there.
