Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unnecessary

It's not as though the book got any of the Bluebooking rules wrong, to my memory, it's just that you should probably invest in a proper Bluebook anyways. For me, the summing-it-up sections in the Bluebook did a better job of getting me the specific certain chunks of information, like useful examples, more quickly than this book did. I'd recommend just skipping this one, and if you're ever really stuck, just doing a Google search for helpful examples (especially if you're already using the normal journal-type Bluebook rules rather than the blue-pages front section).