Very little really
I get the occasional texture glitch where a piece of the world will simply not render, or will be coloured purple or something - but as soon as I spin around or go to the next area it seems to correct itself.
I've had a very occasional crash to desk top, but that might be something else on my PC, like the virus protection updating or something - it doesn't seem to be directly related to any particular thing in the game.
Hmmm, I have had people going to sleep get up, and when they go back to bed they are sideways/levitating to the right, and shopkeepers leaning on a table halfway into it etc. Also like Paul had Sahloknir/certain walls and things be a wierd purple color. Sometimes when looking at fog/fire and I Alt-Tab out the fog/fire will turn all wierd and pixelated and I have to restart. Other than that I've had a good few crashes but so far it seems fine to me :)
i play on the ps3 and it did start to slow down and stutter but i turned all the auto saves off and everything ok now apart from slite gliching the first few seconds after fast travelling to a town but saying that my save file keeps growing and growing it could become unplayable at some point but that's for another day
I've played 152h on PS3 and I`ve experienced my regular share of bugs: dragons flying backwards a couple of times; legs through the walls lots of times; game freezing little more than a dozen of times; game crashing a half dozen times. I really don`t mind the little bugs, they are insignificant. After the patches there are no more crashing, but the freezing is still there, on a regular basis. I get one every 10 or 12 hours of gaming, and that really bothers me, because I need to remember saving the game more often than I want.
Ive had very few glitches really. I did experience the marriage glitch when a dead body appears in the church on your wedding morning. For some reason i still have multiple Louis Letrushes outside the stables in whiterun. Theres 4 of the buggers now lol.
Experienced a few stutters in the frame rate but nothing major. Ive been really lucky i think. One thing i did notice last night when creating a new character it seemed to be struggling to load up the different eye colours for some reason???
I am seeing less texture issues however they still exist, an intire square of water was missing, dragons looking like stuffed animals but thats the extent of it so much better there. There has been weird clothing issues where the clothing was stiff after I killed a bandit and his leg was doing its rag doll thing through his hide armour. A leg kept blikning in and out of visibility though someones clothes. I was wearing a Dragon Priest mask and the Arch Mages clothes and I had no head when I was wearing the mask for some reason. I have had one dragon fly backward which hadn't happened before the patch, most of the quest glitches are still there for me but other than that everything is fine.
Just a few, nothing game breaking:
Giant Bounty from Dawnstar doesn't clear when turned in when turned in to the Jarl. Very minor, simple fix.
Louis Letrush has appeared 3 times outside Whiterun after he was murdered at the end of his quest in Riften. A 4th time he was on the road in the middle of no where and the mercenary appeared and killed him saying the exact same thing that happened in Riften, this was at least 40 hours later and near Markarth. Odd and more random and amusing than anything.
Unable to raise bodies of bandits/bears/anything that have been raised before, then respawned. Rather annoying.
Unable to absorb dragon souls, has to do with if that dragon is a respawn or not, similar to the raise issue.
Major spoiler: Depending on how you progress the main quest after the quest Alduin's Bane,you can miss loads of story. For example, you defeat A on the mountain, speak to the Jarl of WR, then complete the civil war (with no idea the last quest will complete the chain,) you skip the treaty and all the story, then the quest updates to a point where you have no idea what the hell is going on because you were across the map from all the major players. Not a bug exactly, just wonky quest progression.
Have had horses and carts (the ones along the roads) come flying in my field of vision 300 feet in the air moving faster than an arrow shot. I had one horse smash into the road then bounce and cartwheel about 200 feet over a river. I have no explaination.
I've started a Glitches photo album containing screenshots of a few of the issues I've encountered - see http://theskyrimblog.ning.com/photo/albums/glitches
I've had to deal with occasional crashes by saving frequently, and have encountered texture loading problems every now and then. Apart from these low-level bugs, there have been a few quest-related glitches such as cloning of Louis Letrush - got 6 of him now - and a fireball left over from the liberation of Whiterun that just hangs there on the point of impact with the ground.