Galley corrections are one of the toughest things an author will face.
Many start thinking, "What can I live with?".
Truth is, you should've live with any mistake you find! Things such as mispellings and typos will LEAP off the page at your reader, just as much as a continuity error. So if YOU notice it, so will your fans. And if you see a mistake and do not fix it before the book is published, it will return to haunt you!
That said, do not get upset if you later discover you've missed something! Even Harry Potter books have typos. You won't catch everything and neither will your editor. But correct what you can now, before the book hits the market.
Because I promise, reviewers WILL find it!