Dr. Rosen incorrectly explains "proprioception", implying that it's a kind of psychic sense that alerts people when someone else is watching them. In reality, proprioception refers to any sense located entirely within the body (rather than originating externally, like vision and hearing); in particular, the sense of where parts of the body are located relative to each other (such as whether an arm is flexed or extended, or to the left or the right). Occasionally, as a result of brain damage, people lose their sense of proprioception, which makes everyday tasks like walking and eating very difficult. People without proprioception can only walk by carefully watching the positions of their legs, since they can't feel whether their feet are on the ground or off.
When Dr Rosen is explaining the existence of the invisible Alpha, he states that the blind spot in human vision exists because of the way our brains are wired up. In fact this is not true. The blind spot is a literal area in the visual field of an eye where no light-sensing cells exist on the retina, because that is where the optic nerve enters the eyeball. The brain is able to compensate and close over the gap by using information from both eyeballs and by blending in surrounding visual information to cover it.