All the grossed out violence and nudity
...and yet still the most disturbing thing in the show is Erin Moriarty's face.
It was very distracting, especially in the first half of the series. For some reason it looked more noticeable in the first part of the series compared to the last, where she actually still looked ok. Maybe it was the way she had her hair or something, unless they filmed these parts before the surgery? Early Erin looked like she was made up to be some human/ape hybrid character from a Planet of the Apes movie....minus the fur.