I've encountered quite a few bigger bugs lately.
One was when I was running along the road to solitude, I suddenly see an imperial guard standing still looking behind him. Behind him, a horse with a noble guy was floating in the air for exactly one second, after which it went diagonally up in the sky to the right, then further up to the left, back down, and finally up again to the right further and further away until it was out of distance (and quite high) at a great speed. I shrugged, and ran past the guard, only to see the noble guy on his horse run on the road from the direction of Solitude to the guard, and they went on again, acting like nothing happened. xD
Another one happened when I returned to this "place" where I previously completed Sanguine's quest, this time to get something someone apparently lost there. It was filled with enemies again, so in the outer cells I killed everyone to proceed inside. When I did however, I heard some screaming and fighting, and when I advanced a little bit further, I discovered good old Sanguine had chosen to leave his realm and clear the WHOLE area for me.

He didn't say anything to me aside from "What?", "I don't owe you money, do I" and the like. Easy quest was easy. ^^
There's also one where two wolves came running up to me to attack, and I used Kyne's peace so I wouldn't have to deal with them. One of them was succesful, but the other one must've been hit very barely or something, because it still showed the animations to circle around me and run after me to attack, but it never bit at me when near or even attacked me. I had a wolf companion until I entered the ruin I wanted to visit for a quest, then it was gone. Well, he was annoying anyway, frequently stood in my way.