I don't have a list (maybe someone can make one lol) and most of them I learned from this thread, but what I can remember is misaligned eyes (needs disassembling to fix), two of the same head, two of the same arm, two of the same foot, heads loose in the containers (and getting scratched up as a result), eye access panel missing magnets and instead held on with blue tack which got stuck in the hair, and missing magnets for the arms or hands.
I might be missing some, but all that was enough to have me very worried about opening mine lol. Very happy I didn't get a single one!