According to this article Cookbook pulped over 'ground black people' typo You can see what a typo can do to a book. In this case a cookbook.
The one that caused me to pull my hair out wasn't as bad. In fact, I picked up some copies of a flier for my book launch that had the same typo (still usable) and the printer didn't see it.
You see why you need a second pair of eyes to look over your work (better yet, four to five). Not everyone is going to catch everything.
Well, even the professionals mess up sometimes, makes me feel a bit better.