Spitting sutures along incision line. Will the scar get thinner? What are the yellow spots? (photos)

In general, scars contract as they heal. Yes your scar will probably get smaller, but this is also dependent on the amount of tension across your wound.It looks as though you are healing and I am sure your doctor has suggested how to treat the areas that are slow to heal. Be patient and follow your surgeons advice. 5 weeks is still pretty early after surgery.

Small areas like you see along your incision are nothing to be concerned about and will generally contract and fade over the next 3-6 mos.  It is very uncommon that such areas require any surgical correction.  A small amount of ointment on any open areas with a little non-stick gauze cover is generally all you need, but defintiely ask your surgeon for recommendations.