Revealing mistake: Once Zelda hears and responds to the scream of distress, she finds a three headed dragon about to eat the damsel. The dragon is waving its three heads around in a frenzy in excitement of its new prey. This is very poorly animated however. The layers of the animation overlap in several frames leaving a very distracting, almost ghost like trail of the necks that is not supposed to be there. It is not an effect of movement. And the necks are jerky in position, especially the one on the right. The dark and light scales on its necks keep changing too. In an instant, the dark scales on the back of their necks will switch places with the lighter scales on the underside of their necks, then back and forth like they are blinking.
Picture added by Quantom X