These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Let's start with the first chapter of the first volume when the little girl gets possessed and then decapitated and her dismembered head smiles and says, "hi Daddy."
Shortly after, Edith gets possessed and her spine splits open into a set of teeth that chops off and eats Angela's lower half. It grows back, but the reader gets to watch her intestines dangling from her middle for at least a few pages.