In ACT 3 there are some issues with NPC meshes breaking and being low-poly, like Gauntlet Edwynna on the path to the city or the Bugbear bartender in the Guildhall or all Flaming Fists having an obvious low-quality LOD texture on their armor.
The bugbear is even worse because he keeps shifting between different LOD states all the time;
All Flaming Fist members have this very obvious low-poly LOD cloth/collar under their armor.