Ensemble Dark Horse: Paige. Probably helped by being played by the biggest name in the cast at that point (Denise Richards) and being the most distinctive of the gals on a visual level (Paige is dark-haired while most of the others minus Katherine Heigl are blonde).
Harsher in Hindsight: The killer's motivations became this in the wake of a number of killing sprees committed by self-described "involuntary celibates" (or "incels"). The most notable include a mass shooting in 2009 at a gym in Collier County, Pennsylvania in which three people were killed (not counting the gunman) and nine others were injured, another mass shooting in 2013 in Isla Vista, California in which six people were killed (again, not counting the shooter) and fourteen more were wounded, and a van attack in Toronto in 2018 in which ten people were killed and sixteen more were injured (the killer was apprehended alive). All of the killers left behind videos, diaries, and/or social media posts indicating that they were committing their attacks as revenge against women and society in general for "denying" them sex and affection.
Jerkass Woobie: Jeremy Melton/Adam Carr may not be justified in murdering the women who framed him, but you can feel some sympathy for the hell he spent most of his life in, for something he didn't do.
Adam: All I can think is when someone is that lonely or that angry they can learn to hide it. But inside, it never dies. It just stays there. Eats away at you. Until one day, you have to do something about it.
Narm: Lilys blubbering after biting into the maggot-filled chocolate can be a little ridiculous.
Moment of Awesome: Henri Barrow is an ordinary human being in a world of cosmic horrors, and in a Never Mythos short story, where bad things tend to happen to ordinary people. Despite this, Henri manages to wound an Eldritch Abomination and escape, promising to return and bring vengeance onto Helen for what she has done.
Nausea Fuel: The final chapter. To elaborate, thousands of civilians in Bacio who have all fallen under Helen and the Padre's brainwashing powers have a colossal orgy. Keep in mind, the civilians in question are all horribly mutated, deformed abominations who mutilate each other whilst having sex, as demonstrated with Doug and Anita.
Bacio itself is an idyllic little commune with a dark little secret. Enslaved to the lusts of its 'mayor' Helen Valentine, the literal mother to most of the town via her relationship with an eldritch horror known as Il Padre, the people are warped by the Padre's fluids and made to participate in nightmarish orgies of lust and violence. Functioning solely as Helen's kingdom, Bacio is one of the most nightmarish places in all the Never mythos.
Helen Valentine herself is an unbelievably disturbing villain, even in a world with Lucia, Vladik Cardinous and Nyarlathotep himself. A simple human woman who's lived for centuries, Helen produces children to use them as fodder in her twisted little revels, combining sex and violence solely so she can savor the 'pain' of love. It says a lot that between her and Il Padre, Helen easily comes off as the most monstrous of the duo.