There were so many flaws in Drifter: Henry Lee Lucas, I don't know where to start ...
TV Movie of the Week quality.
Twice, one of the actors looked at the camera. In any real movie, the editor/director would have re-shot the scene.
When the dead hitchhiker is getting raped on the couch, you can see the camerman's shadow.
Henry's scar on his eye keeps changing between scenes.
When the doctor is preparing to give Henry shock treatment, he has the nurse take out Henry's glass eye. While he's shocking Henry and questioning him afterward, it is obvious that the eye is still in place, the actor is just looking upward to make it more ominous.
The actors' "accents" were too funny. I'm guessing the director told them to "talk real slow, cuz that's how dumb people talk."
Overall, fairly laughable. Unfortunately, not funny enough to be a cult classic.