- Big-Lipped Alligator Moment: The fake Wolf Baby trailer. It's meant to be an homage to grindhouse trailers, but still doesn't have any real context in the movie itself.
- Crosses the Line Twice: Basically the entire movie.
- Cry for the Devil: Attempted, but hardly ever any success is made. The killer had a miserable childhood that would make him sympathetic if it didn't come off as such a desperate attempt to justify his misogyny, coupled with the sheer pleasure he takes in his absurdly brutal murders.
- Darkness-Induced Audience Apathy: The movie's about a revolting Serial Killer who keeps having flashbacks to his abusive childhood. And none of the other minor characters are very likable, except for Jess and Maggot. So it's pretty easy to lose much care for what happens to anyone in the movie.
- Ensemble Dark Horse: While he's not exactly a minor character, being the guiding force behind the killer's murders and everything, the Skull Boy is often considered the most intriguing character in the film.
- Narm: LOTS. It is, after all, a grindhouse homage. Namely, Shane Beasley's overacting when he's hacking into victims or raping their severed heads, as well as the scene towards the end where he hallucinates his mother's severed head calling him a "fucking freak" as he penetrates it.
- Nausea Fuel: There are many, many scenes in which the killer devours the eyeballs of his victims, and we get to see the whites of the eyes slowly ooze from his mouth as he bites down on them. The repetition doesn't make it any less gross. And that's not even mentioning that he likes to sexually penetrate the stumps of their necks.
- Nightmare Fuel: It's a gory movie featuring a psychologically damaged serial killer with a fondness for cutting off heads and gouging eyes. This trope is guaranteed.
- He has several bizarre dream sequences with a tree covered in eyes. And if that's not bizarre enough, he also fantasizes about having sex with a woman with no facial features except lips.
- Some of the heads of his victims are shown on a shelf, rotting away. And that's not even mentioning when they appear to come alive at the end.
- The entire climax of the film. The killer slaughters Jess, then degenerates into total madness, ripping his own face off before locking himself up in his cage.
- Squick: Besides the obvious gore, the sister is implied to have a warped, incestuous crush on her brother. This is first established when she asks if he's thirsty, and urinates on him.
- Tear Jerker: As difficult as it is to feel any pity for the killer, the flashbacks to his childhood and his crying scenes can be rather heartbreaking.
- Unfortunate Implications: One reviewer points out the misogynistic themes of the movie that besides the senseless violence.The film alternates between scenes of extreme gore and flashbacks to the killer's childhood when his mother and sister tortured him for their amusement. The jejune attempts at psychology feel like the fever dream of some Men's Rights Activist whose biggest fear is the castrating Medusa.
- The Woobie: Every single one of the killer's victims, with the exceptions of his mother and sister, and Slick Vick. The killer himself as well, to some degree.
YMMV / Headless