In the Hitchens video, everything is carried out pretty much according to universal waterboarding protocol as we’ve come to understand it. His limbs and torso are tightly bound by restraints. The platform on which he lays appears to be tilted slightly downward so that his head is positioned below his heart. His head is also completely covered and the water used looks as though it’s poured directly into his breathing passages.
In contrast, Mancow isn’t bound by restraints at all, he doesn’t appear to have his body positioned at a decline, only a portion of his face from the nose up is covered, and the water is being poured on him inappropriately.