I would assume you have final approval anyways, even if the artist had made that mistake, right?
Sometimes when a card is wrong I do get to say, and get it fixed. Sometimes we use the error because of the nature of it, e.g. it defies physics or history but no-one will care. For years I didn't see everything and so some stuff would just be a surprise on the cards.
For most companies I wouldn't expect to have any say on art; not my department. I might comment anyway if saw some, but you know. For example for Pina Pirata, I said, isn't this art too fiddly, and they said, what, you don't like it? And they used it and then you couldn't recognize the cards upside-down and they added icons and color-coding for later printings.