We've noticed about a handful or so of errors in the book. Usually the professor will point them out. Nothing very critical, usually a mislabeled figure that doesn't match what the text says, etc.... I wouldn't say that there are "lots" per se, every book is going to have to some errors in it.
I've noticed 2 or 3, noticed them without the professor's help, so any other student should be able to notice them too. Apart from that, it was a really really great textbook.