- "Conjuration Ritual Spell" - Dremora doesn't de-spawn at the end of it, nor can it be killed (attacks just go through it as if it isn't there).
- "The Cursed Tribe" - When returning to Largashbur with the ingredients, Gularzob was lying dead on the ground inside the fence (tried re-doing/reloading it several times, all with the same result). While a giant was attacking the tribe at the time, the giant was outside the fence. Particularly odd since Gularzob is named the tribe's leader at the end of the quest.
- "Worn Shrouded" clothing (cowl, boots, gloves) in Master Bedroom of Dawnstar Sanctuary adds weight to inventory when picked up, but does not appear in the inventory list.
- The sword the Jarl of Riften gives you upon becoming a Thane is just a generic magic blade, not the one it's supposed to be (haven't tried with Maven as Jarl, though I've read that is a workaround... sort of)
- Cannot sacrifice Cicero or Dark Brotherhood initiates for Boethiah's quest (I forget the name of it) upon completion of the Dark Brotherhood questline; they just stand there when you tell them to touch the pillar.
And finally, one that's already on the list, but I'll repeat it anyway since it's annoying: Esbern's potion doesn't work, and the quest stays in your journal.
EDIT: Oh, and there's significantly more random lag than there was prior to 1.4. Before that, I had almost no problems with it. Now it's more common (still not unplayable, but it's definitely happening more).