- Director David Fincher shot more than 1,500 rolls of film for the film, more than three times the normal number.
- Brad Pitt’s role was originally intended to read a real homemade explosives recipe. Out of consideration for public safety, the filmmaker replaced this recipe with a fictitious and unusable recipe.
- Although Edward Norton refused to smoke in the 1998 movie "The King of Gambling", he did indeed smoke in this movie.
- When the film crew was shooting in an urban residential location, a male resident upstairs could not bear the noise of the filming, and threw a 40-ounce beer bottle down. Although the bottle hit the director of photography Jeff Collinweis, it did. Without really hurting him, the householder was subsequently arrested and detained.
- In the filming of Brad Pitt and Edward Norton playing golf drunkly, they were really drunk, so the golf ball was hit and flew directly to the crew's supply car.
- In the film's preconceived vision, Brad Pitt and Edward Norton are excited to discover that they both hate the new Beetle, so in the movie, the audience can see them hitting a new Beetle with a baseball bat.
- An act of vandalism in the movie was to destroy Apple's Macintosh computer. This sabotage appeared in the 84th minute of the movie.
- The brown wagon where Brad Pitt and Edward Norton fought for the first time was the same car that James Ribeiro drove Michael Douglas to Coast Radio when the director was filming "Mind Game" in 1997. The windshield of this car also has the CRS logo affixed to it.
- The names of the three detectives in the film are Detective Andrew, Detective Kevin and Detective Walker. Andrew Kevin Walker is actually the author of the film "The Seven Deadly Sins" filmed by director David Fincher in 1995.
- When Tyler jumped into a red convertible at the airport, a man could be heard calling "Hey, that's my car!".
- In Taylor's house, the cover girl of a movie magazine is Drew Barrymore, who is a good friend of Edward Norton.
- Most of Brad Pitt and Helena’s bed scenes are computer-synthesized.
- Brad Pitt and Edward Norton really learned how to make soap during filming.
Fight Club behind the scenes gags
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Narrator: Bob had bitch tits.
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Narrator: Tyler was a night person. While the rest of us were sleeping, he worked. He had one part time job as a projectionist. See, a movie doesn't come all on one big reel. It comes on a few. So someone has to be there to switch the projectors at the exact moment that one reel ends and the next one begins. If you look for it, you can see these little dots come into the upper right-hand corner of the screen.
Tyler Durden: In the industry, we call them "cigarette burns."
Narrator: That's the cue for a changeover. He flips the projectors, the movie keeps right on going, and nobody in the audience has any idea.
Tyler Durden: Why would anyone want this shit job?
Narrator: Because it affords him other interesting opportunities.
Tyler Durden: Like splicing single frames of pornography into family films.