Some books also do actually use some interesting literary techniques which do stand out. For example, Things We Didn't See Coming is quite distinct in that each "chapter" (short story, vignette, whatever term you want to use - which is interesting in itself since it the US it's marketed as a short story collection, while in Australia it's marketed as a novel - "discontinuous narrative" is the phrase that I settled on using for my essays, I saw that said in an interview with the author that I read once) does jump quite a few years every time.
Considering that the book is also first person, the fact that the narrator is a kid at the start of the book and a middle-aged man only a couple of hundred pages later, naturally has quite an affect on how the story is told and what goes through the narrator's head. In addition, the book doesn't even spend a great deal of time describing the various changes the world goes through in depth, which makes a fair bit of sense if you spend a bit of time thinking about it. It's a first person account and if you were in the narrator's situation you wouldn't waste your time describing what the world is like when your life is at risk. Anyway, I'm starting to ramble and get into the themes of the book, which is completely irrelevant to what I was going to say.
IMO, thinking about why the book was written the way it was, especially if it's bleedingly obvious like in the case of Things We Didn't See Coming, lends itself pretty naturally to being material for an essay - and that's not even really reading into the book that much.