I read just about all of Feist's books again last year, and I really noticed the errors. In the last book of the serpent war saga (I think) there was more than spelling and grammatical mistakes, there was a couple of plot problems too - for example Eric told his half-brother (? sorry it was a while ago) twice about the baby von Darkmoor.
It seems strange that there are so many mistakes in his books. I don't notice it as much elsewhere.
But that doesn't mean I don't still love his books
. I wouldn't have read them so many times if I didn't lol.