Hi Stephen, I don't think you can see "casting flaws" on this ring, because I think the faker worked on the wax model, exactly as Gahr did, and we perfectly know that a good casting process doesn't produce what we call "casting flaws". We tend to believe casting processes are low quality processes, but actually this is only a myth...
A good casting production process has characteristics and micro flaws (of course!) that a die stricking process cannot have.
In this case, the flaws you highlighted on the Hagal rune are not "flaws", the dot is IMO the result of a hit, the one on the right arm of the rune is matching the shape of the originals (the rune was good enough in the original, so the faker no needed to rework the entire runic panel here), and he reworked only the left side and the leaves on the left.