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.
Death of the Author: Later in life, Bradbury claimed that the book is not about government censorship. Instead, he says that books are illegal in his story because excessive political correctness censored literature into oblivion and television destroyed interest in reading altogether, to the point that the people demanded books to be banned. As such, the culprit is the people themselves rather than government. Despite Bradbury's assertions, the book is almost universally read as a statement on government censorship used to pacify the citizenry.
Ensemble Darkhorse: Clarisse enjoyed a similar fate to Sherlock Holmes', as her popularity among readers and their interest in her ambiguous fate in the novel prompted Bradbury to follow the film's example and reveal she's still alive at the end of the stage play.
Montag coming home to find Mildred unconscious from a drug overdose (and the uncaring doctors coming in to pump her stomach).
Heck, the entire premise counts.
From the movie (during the scene of the old lady burning her own house so the firemen can't arrest her): "Nine elevenths are ninety-nine, nine twelfths are a hundred and eight, nine thirteens are a hundred and seventeen, nine fourteenths are a hundred and twenty-six..."
Special Effect Failure: The "jetpacks" in the film are very shoddy. Apparently they couldn't afford real helicopters.
Squick: Besides the Family-Unfriendly Death, there's also the scene in the novel in which Millie gets her stomach pumped after an apparent suicide attempt. This one is specifically called disgusting by the narrator.
Values Dissonance: At one point a discussion on politics is entirely focused on comparing the President to his last political challenger in a very superficial way, with a woman complaining that the challenger dressed unflatteringly, and picked his nose on national television. While this was intended to underscore how superficial she was, modern readers would be scratching their heads at what political party would nominate such an unprofessional individual in the first place.
Values Resonance: This novel predicted iPods, flatscreen TVs, the decline of quality in public schools, prescription drug abuse, people abandoning books for new media, and everyone living in fear over war, but not really taking action. The Choose Your Own Adventure television shows are awfully similar to video-games too.