Broken Base: Despite its popularity, there are sections of Kurt/Blaine fandom who don't care for the fic, or for the pervasive statements that "Dalton" is "practically canon anyway". Bringing up the fic with any of them will lead to flame wars.
Nightmare Fuel: Adam has a wall in his room covered in photos, mostly of Julian but also of the people he intends to kill- and most of them were stuck to the wall with blood, most likely his own. We hope.
Strangled by the Red String: Shane and Reed appear to have nothing in common, interact very rarely in-story, and yet seem to be in love. Confirmed on Shane's side, possibly confirmed by Reed's crying when Shane leaves.
Lampshaded to hell and back, though, especially by Reed.