The animation error wasn't real. What a shame.
I've rewatched the clip over and over and I didn't see even one frame where DD had... 5 hooves.
If you go back to the image kaka posted and look very closely, you can see a small outline on the leg that isn't supposed to be there, and it's not caused by a JPG artifact. This outline is caused from being copypasted from the leg that is on the lighter part of the background gradient.
Mystery debunked. Me - 1, Atheists - 0.
