The crypts at the castle. Filled with the bodies of everyone the NWA has killed, including such innocents as underage drinkers and Traveller children. There appear to be far more bodies than there are people living in the village. Especially the skeletal remains of the family in the caravan.
"We will make Sanford great again" sounds similar to a certain recent slogan that, because of just how the NWA wanted to make their town great again, becomes a lot more chilling.
The concept of the town in general, where everything is run by a shady organization more than willing to kill for absurd, petty reasons.
Skinner rushing at a defenseless Angel, boxcutter in hand, with pure, blind rage in his eyes. Let's face it: it was pure luck that saved Angel's life, there.