Missing loottables:

naxxramas:
-patchwerk (only drops gold)
- noth the plaguebringer ( drops no loot at all)

aq40:
-c'thun (loot window won't show up once you right click on him when he's death, and when you try to cancel looting it will keep you kneeling down)

bwl

-ebonroc (missing ebony flame gloves)
-firemaw (missing clutch of firemaw)
-nefarian ( missing every non-t2 item except for unnecessary blues,nefarians head,staff of the shadowflame and recipes....)


wrong loottables:

naxxramas:
-heigan the unclean (drops the same stuff as grobbulus)
- maexxna (missing some items like kiss of the spider,pendant of forgotten names and crystal webbed robe but dropping some other items instead which shouldn't actually drop off her like severance, hatchet of sundered bone, the plague bearer, wand of fates)
-4 horseman (all of them drop corrupted ashbringer but noone will drop any other item they're supposed to do)