At 7:10 Zarathustra tells Hercules to cut directly above Iolaus/Dahak's heart. The human heart is slightly to the left of center of the chest cavity, but Hercules clearly cuts the right side of the chest.
At 17:47 Dahak states "I brought the serpent of temptation into man's garden" thus claiming responsibility for the temptation of Eve in the Garden of Eden.
There are numerous similarities to The Exorcist (1973), one of the first widely accepted movies about demon possession.