Tyler appears in the film four times before we clearly see him on the moving walkway at the airport. In the first four appearances, he flashes on screen for a single frame (1/24 of a second) and only when the Narrator has insomnia: at the photocopier at work; in the corridor outside the doctor’s office, at the testicular cancer group’s meeting and as the Narrator sees Marla leaving a meeting but doesn’t follow her. 

Author Chuck Palahniuk first came up with the idea for the novel after being beaten up on a camping trip when he complained to some nearby campers about the noise of their radio. When he returned to work, he was fascinated to find that nobody would mention or acknowledge his injuries, instead saying such commonplace things as “How was your weekend?” Palahniuk concluded that the reason people reacted this way was because if they asked him what had happened, a degree of personal interaction would be necessary, and his workmates simply didn’t care enough to connect with him on a personal level. It was his fascination with this societal ‘blocking’ which became the foundation for the novel.

In the scene where Tyler is giving an inspirational speech to the Fight Club members, he says “We’ve all been raised on television to believe that one day we’d all be millionaires and movie gods and rock stars.” Right as he says “rock star” at 1:11:00, he looks specifically at Jared Leto’s character. Jared Leto formed the band ‘30 Seconds to Mars’ in 1998. Their last album went platinum.

When the Narrator hits Tyler Durden in the ear, Edward Norton actually did hit Brad Pitt in the ear. He was originally going to fake hit him, but before the scene, David Fincher pulled Norton aside and told him to hit him in the ear. After Norton hit him in the scene, you can see him smiling and laughing while Pitt is in pain.

While Edward Norton is trying to convince Helena Bonham Carter to leave the city by bus, the crew arranged cinema signs to make references to other films the cast had been in, although only one is visible during the actual scene. Seven Years in Tibet (starring Brad Pitt) is visible, although the sign letters actually say “Seven Year In Tibe” as if the theatre didn’t have the required letters. Other marquees (in the far background, and not visible) reportedly said The People vs. Larry Flynt (starring Norton) and The Wings of the Dove (starring Carter).

The scene where The Narrator’s boss (Zach Grenier) finds the rules of Fight Club in the photocopier and The Narrator points out that whoever wrote it is obviously dangerous and might one day storm through the building shooting everyone, proved to be a highly controversial scene for the filmmakers. In early test screenings, the scene got huge laughs and scored extremely highly with audiences. However, these screenings happened before the Columbine massacre. In all screenings after Columbine, the scene evoked no laughter whatsoever and scored extremely poorly, with audiences commenting that they felt it was in bad taste. This prompted the studio to ask director David Fincher to cut the scene altogether. Fincher considered doing so, but because the scene leads into the pivotal Marla breast-cancer scene, he decided that it couldn’t be cut.

During the shooting of the sex scene, actors Brad Pitt and Helena Bonham Carter posed in 10 different positions from the Kama Sutra  and spent three days recording orgasmic sounds for their unseen sex scenes.

In the short scene when Brad Pitt and Edward Norton are drunk and hitting golf balls, they really are drunk, and the golf balls are sailing directly into the side of the catering truck.

In Tyler Durden’s house there is a Movieline magazine cover featuring Drew Barrymore, a close friend of Edward Norton. The Blu-Ray edition of the film (released in November 2009) contains another “in-joke” reference to Barrymore; a fake menu for the film Never Been Kissed, which was released the same year as this film.