Originally Posted by Retributi0n

There are also certain anatomical issues they were ignored such as the fact draining blood from the circulatory system causes the vessels to collapse which would make reintroduction of blood as depicted in the film difficult if not impossible. Also the procedure with severed head only mentioned oxygenated blood being fed back into the severed head. Neural cells require other components besides just oxygen to survive and function properly for anything but the briefest time. It seems likely that while the experiments were not faked in their entirety the film itself was staged and the achievements exaggerated.