I made an error on Magnus where he was supposed to be able to use the axe right out from the beginning of his life on Layonara, but forgot to give him the martial weapons feat since he was a cleric and had to remake him.
Also, I made an error on Caldiir, but not on stats or skill points. I gave him tatoos, but didn't realize until I was ingame that those tats look really bad on black skin. It doesn't matter though since I cover most of them up or use different sets of arms.