Both hostile and passive mobs have random animation glitches. They will look fine at first but once they start to move it will look like someone hit the fast forward button. The sudden lurches in animation will also cause mobs to glitch through blocks, shoot all over the screen, or look as if they were launched into the sky. I have not been able to get a picture of this due to the random, sudden, and extreme nature of these glitches. I have not been able to interact with these mobs either. Seems to be worse during auto saves but turning this off has not stopped the issue.