I completely understand your concerns but I want to tell you that the Study Guide did go through two professional proofreaders and a copy editor before it was published. Please remember this is our first edition.
As for the questions at the back of each chapter, they are retired questions that aren't used anymore for CAP. There is a sentence at the top of each that states they aren't current items. Items are retired for a variety of reasons some it the wording of the question. The examples of questions are only provided to help candidates become familiar with the type of multiple-choice questions that are on the exam not content.
As for the writers of the CAP questions, they are a completely different set of subject-matter experts (SMEs). They cannot be the same group that created the study guide due to conflict of interest and certification standards. Both sets of SMEs only saw the CAP Body of Knowledge, that is the only common point.
I want to correct any errors that people are finding. Typos and misspellings should not be in the guide because we paid a fair amount of money for the proofreaders.