The list goes on.
However, this glitch I saw the other day takes the cake.
I emerged from Helgen cave with a fresh character, walked down the path towards riverwood.
To my left, out of the corner of my eye, I swore I could see antlers in the water.
I made my way down to the river's edge, and I counted 5 rabbits, a deer, and two foxes all swimming/floating upside-down. Alive.
Seriously, WTF?