Sentence:  This chapter describes the most common responsiveness <WSD>bloopers</WSD> and explains why developers commit them. It is organized differently from the other <WSD>bloopers</WSD> chapters of this book because responsiveness <WSD>bloopers</WSD> are all closely related to one another; they are all really variations on the same underlying <WSD>blooper</WSD>, with the same underlying reasons and solutions. 
Meaning of the word marked with <WSD> tags:  A blunder, an error.