Continuity errors

Have you guys noticed any? I'm 3/4ths through Book 3 rn, and at least in Book 3 there's a random section where Solin Spittle loses her lisp, but regains it later - and in Book 2 I think Uspa has a thrall collar at one point, but wasn't she super against having a thrall collar because she will have no reason to live if she can't get to her son..? Or did that change with the blodsvarid and I forgot it being mentioned?