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.
YMMV: Fight Club
Anvilicious: Tyler Durden's message of "Consumerism is BAD!" is so anvilicious that it's often taken as the actual film's message. These viewers tend to forget that Durden is the villain of the film. Durden has a point, but he's insane— in fact, he IS a mental illness!— and his actions are extreme. Ultimately, the story suggests a balance between the narrator's neutered existence and Durden's neo-primitive anarcho-terrorist philosophy.
Alternatively The personalities finally merged, thus the person at the end is a combination of both the narrator and Tyler Durden.
Crosses the Line Twice: Marla's line, "Oh, God. I haven't been fucked like that since grade school." In the book, her line while in bed with Tyler was, "I want to have your abortion," which studio executives ordered David Fincher to change for the film. When they heard what he had come up with instead, they begged to have it changed back. Helena Bonham-Carter (who is British) assumed that "grade school" meant high school. She was quite surprised when she found out after the fact, which she discusses on the DVD commentary.
Cult Classic: To the point that people started real Fight Clubs.
Draco in Leather Pants: How many real-life followers do you think he'd have if he were played by someone less handsome than Brad Pitt? This is directly Lampshaded when Tyler and the Narrator mock an underwear model in a bus ad.
Several university film departments (and even many admission departments) outright refuse to accept essays about the movie version because not only are they ubiquitous, but they almost all fall into this trope.
As far as theories go, a popular one posits that the narrator is the adult version of Calvin from Calvin and Hobbes, with Marla as Susie Derkins, Tyler as Hobbes, and Bob as Moe (whose bitch-tits are a karmic punishment for bullying Calvin).
Fountain of Memes: Tyler Durden's rhetoric is designed to be catchy and quotable, both in-universe and out.
When Tyler talks about how the media has led people to believe that they will all be "millionaires, movie gods, and rock stars," he's looking at Angel Face. Said character is played by Jared Leto, who would later go on to front the band 30 Seconds to Mars.
I Am Not Shazam: In the movie, the nameless narrator often refers to himself as "I am Jack's [body part/emotion]" and does the same for "Joe" in the book. This is not actually his name and was only decided upon by a series of articles in Readers Digest (book) or Annotated Reader (movie). Even those who understand this fact find it a convenient nickname. "Jack" was used as his name in the script and as a frame of reference behind the scenes since they had to call him something.
When the film is shown on TV, closed captions sometimes indicate his name as "Rupert" (this is one of the fake names he gives at the support groups).
Jerkass Woobie: Tyler. He is only a split personality of the narrator and is literally the personified composite of his rage and melancholy; he hates himself, hence his pontificating about self-destruction and hitting bottom. And the narrator, the very person who created him, kills him at the end of the film. However, he is also a nihilistic sociopath.
Magnum Opus: Up until the release of The Social Network (or, for some cinephiles, Film/Zodiac), this and Se7en were held in high esteem as David Fincher's best films. It's still his highest-rated film on IMDB, as the 10th best-reviewed film on the entire site.
Memetic Mutation: "The first rule of Fight Club is, you do not talk about Fight Club. The second rule of Fight Club is, you do not talk about Fight Club." Much referenced and parodied, it's practically on the way to being a Stock Shout-Out.
It's also worth noting that Tyler does initially start out kinda reasonable, if very rebellious. His increasing fanaticism is presumably indicative of the Narrator's own decaying mental state.
Even if it was not the original intent of the book, Palahniuk does seem to lap up the adulation and attention that the movie has sent his way. In his introduction to the 2004 edition of the novel, he describes encounters with fans who boast about masturbating into restaurant food... amongst other things.
Something of a misaimed hatedom: Roger Ebert declared this movie "cheerfully fascist" and not only gave it a poor review, but reviewed several movies positively by bashing this movie in comparison to them. Apparently he didn't catch that all the extreme opinions and ideas are held by a character who's literally a walking symptom of mental illness.
Moral Event Horizon: Tyler spends the film slowly moseying across it: acts of playful vandalism give way to more violent terrorism, culminating in when he decides to blow up several entire buildings - and just in case you've bought into his philosophy enough to be okay with that, he also attempts, or at least intends to kill Marla.
Paranoia Fuel: So there's this enormous anarchist group hiding right under our noses whose members like nothing more than committing acts of violence and putting certain, er, bodily fluids in our food at restaurants...
Also, having an alternate personality you're not even aware of that comes out when you're "asleep" and is determined to take over your life completely.
The Problem with Licensed Games: The film was adapted as a fairly generic brawling game, which was poorly received, often leading fans to come up with an unofficial "third" rule about Fight Club, in that you do NOT talk about Fight Club: The Game.
Rewatch Bonus: A huge part of the popularity and enduring appeal of the film. The second time you watch the film, you'll wonder how you didn't realize that Tyler is not real, that you may have handwaved as coincidences the first time round, such as Tyler and the protagonist owning the same type of suitcase, or even as continuity errors such as the Narrator being pulled from the driver's seat after the car crash. In fact the film has so many examples that it has its own page - suffice to say that when you finish it, you will watch it again almost immediately. You'll also be amazed at how much your perception of Marla changes the second time around - her actions seem far less irrational once you have the whole picture. You'll also try to spot all the single frame shots of Tyler that appear before he actually shows up in-character.
For both David Fincher and Chuck Palahniuk. Practically every book Palahniuk has written since has been directly compared to this one, while Fincher has only just escaped the shadow of the film with 2010's The Social Network (although his earlier Seven was and still is held in higher esteem than Fight Club by most film critics and academics).