Dont know if any of these have been mentioned or if I should even bother to but here I go:

1. When loading a save into my house, interior walls, bookshelves and tables disappear making everything on top of them fall to the ground. I could also walk through the areas where the walls used to be. (reloading the save fixed the problem)

2. While completing quests the npcs failed to give me my rewards (ex Alessandra in the pilgrimage quest in Riften halls of the dead.)

3. Quest items really need to be storeable/droppable, why should I have to hold every stone of barenziah till I have 24. (Yea I got no stamina)

4. Some items claiming to be quest items are trapped in my inventory when I dont have quests for them (Giant's Toe, 2 Alto wines etc) I fear plucking more Giant's toes will lead to having more of them trapped in my inventory.

5. Corpses, mainly dragon corpses don't disappear, they move around (corpse in Winterhold slowly being absorbed into the ground, corpse in Whiterun slowly moved into the town center than trapped itself within the general good's porch and took an upside down nap).

6. Arrow stuck on my head, self explanatory.

7. Quests that request an item will most times remove a similar item if available instead of the required one, while other quests complete and dont take anything, and I end up keeping the item (Retrieve the staff quest in Winterhold)

8. Not as important but while wearing Arch Mage's robes and Morokei, my face disappears, so yea, headless mage.