These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Do Not Do This Cool Thing: "The Fig Leaf" mentions how some authors will describe a titillating scene in salacious detail, then apologize for it by having the protagonist express their distaste. The book recommends against this, and suggests that if exploitative scenes are to be shown, the author should embrace sleaziness wholeheartedly.
Genius Bonus: Their slam on Shown Their Work throws in a whopper. The biologist mentions sexual reproduction's origin in algae 2.7 million years ago. That error is off by about three orders of magnitude - a factor of about a thousand (to put that in perspective, it's like saying the distance between LA and New York is roughly three miles). We certainly also don't have a common ancestor with algae at this time; any common ancestor between humans and algae would have lived long before this. Due to Stylistic Suck, it's impossible to tell if the authors were sneaking in one more example of how important research is, including a little bonus, or failing biology harder than a Kansas school board while telling authors they cannot make afford to make such mistakes themselves.
Hilarious in Hindsight: In the chapter about how not to pitch a novel, they warn against trying to sell fanfiction to a publisher, instead advising writers to "go back and change all the names". Three years later, Fifty Shades of Grey, a novel which originated as Twilight fan fiction, was published to massive commercial success.