Kiss 'N Tell - S1-E4
Continuity mistake: When Link jumps down off the rock and lands on the dragon's middle head, he then jumps up and off the head just before the other two blast at him. But when he does you can see that the middle head suddenly doesn't have a horn any more, where it was present even as Link jumped on it. It's then back again after Link zaps the other two heads and is red from the burns. (00:03:35)