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.
Nightmare Fuel: the whole thing is pretty chilling, especially the way they refer to a donor's death as "completing."
Sci-Fi Ghetto: Don't you dare call this book science fiction. Sure there are sci-fi elements, but that doesn't make it sci-fi. Why? Because sci-fi is for grubby basement dwellers, and really smart people like this, therefore it must be literature. Don't you dare call this book speculative fiction/fantasy. Sure there are speculative fiction/ wizard elements, but that doesn't make it speculative fiction/fantasy. Why? Because speculative fiction/fantasy is for people interested in plots that don't require a suspension of disbelief the size of (insert celestial body here) and really forgiving people like this, therefore it must be speculative fiction/fantasy with plot holes.
And it's not only because of the characters themselves, but for the thousands of other clones they represent.
Utopia / Dystopia: Deconstructed. To us, the lives of the clones must seem pretty dystopic: no family, strict boarding schools, no ability to have children, donating organs then premature death. And they are conditioned to accept this as the only way of life, and that escape causes pain. However, as is Miss Emily's point at the end of the film, human are free of serious illness and live to over 100, which, from the audience's point of view, would usually be regarded as something of a utopian circumstance. Our perception of this world as good or bad is based solely around our protagonists.
It's not a utopia, by definition, if a major chunk of the society's people are deliberately and uncaringly treated horrifically for the betterment of others. Utopia is all about being an ideal society for everyone in it, so a utopia with a major subset of the population being the exact opposite of ideal cannot be a utopia.