Go in close and study the problem areas. See if the polygons are actually joined at the seams and manually do so if they are not. The points may not be actually sharing the same location and thus a merge and unify may not do the trick.
you could try a merge points with a manual distance value but you may go too far and screw up the geometry.
ensure your smoothing is set to good values. make sure you're not using a fussy camera and light set up.
As it is an organic model meant to be deformed tripling will ensure the best results anyway
if all else fails just triple the problem areas.
I cannot say any more without actually seeing the mesh
