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.
Dude, Not Funny! - the book incorporates several racist and sexist themes and tries to use them humourously. While sometimes it's successful satire, other times it just falls really, really flat.
Just Here for Godzilla - From the back cover: "Pride and Prejudice and Zombies transforms a masterpiece of world literature into something you'd actually want to read."
The most readable thing is probably the back cover itself, if only for the About The Author lines. "Jane Austen is the author of Sense and Sensibility, Persuasion, Mansfield Park, and other masterpieces of English literature. Seth Grahame-Smith once took a class in English literature."
Amazon's variant is better still. "Jane Austen is the author of Sense and Sensibility, Persuasion, Mansfield Park, and other masterpieces of English literature. Seth Grahame-Smith is the author of How to Survive a Horror Movie and The Big Book of Porn."
Magnificent Bastard - Lady Catherine in Dreadfully Ever After. Within days of being informed of the situation with Darcy, she's whipped up an elaborate scheme to get him back to the match she wanted with her daughter, and has all the Bennetts dancing on strings thanks to holding the only hope of saving him.
Rescued from the Scrappy Heap - As in the original, Kitty and Lydia spend the first two books as clones of their mother, completely shallow and concerned with nothing but nabbing a rich husband. But by Dreadfully Ever After, Kitty has matured considerably, ashamed of her previous behavior and determined to help her family any way she can.