I have had a pair with similar marks (visible needle holes in the upper near the welt). It could be where the welt was stitched improperly to the canvas gemming, and they removed it and re-stitched it. The picture is a bit blurry so it is hard to tell for sure. It could also concievably be where the leather was slightly damaged when the outsole was being stitched to the welt. I have also had a pair where there were a few tiny "cracks" in the leather near the welt which didn't go very deep. They could be from the lasting process where the leather was slightly damaged when the leather was being pulled over the last by the lasting pliers. In both cases, I kept the shoes because I didn't think they posed a structural problem. I do make sure I put a little extra conditioner and polish on the area to ensure the area is extra protected. As for the heel, it is hard to tell for sure there as well because the picture is slightly blurry, but it looks fine to me. It may just be where the edge of the piece of leather in the stacked heel had an uneven surface near the edge which translates to looking like a "split." That happens periodically as well. If that is all it is, then there is still alot of surface area that is making good contact and the heel will be fine. If it were to separate, fixing the heel down the road is one of the most elementary shoe repair jobs that just about anyone can do. So once again, I'd keep them. These are relatively common problems to see with seconds, so if you get into the return/exchange cycle, you may well end up with a pair with bigger problems.