- Approval of God: Hunter S. Thompson loved Johnny Depp's performance, claiming that if he ever met anyone as despicable as Depp's Duke, he'd immediately want to hit them with a chair. The only thing in the film Thompson has been known to directly object to, was the scene where Duke throws coins at the ground for the dwarf waiter to pick up. Thompson was very insistent that the moment was an improvisation from Depp, and that in real life he would never have done something so demeaning.
- Doing It for the Art: Nearly everyone in the film, but special credit goes to Benicio del Toro, who burned his arm with cigarettes to match the burns on Oscar Acosta's arm, and ended up getting blood poisoning. He also gained 40 pounds for the role. He tried to put on even more weight, but there wasn't time.
- DVD Commentary: The Criterion Edition has several commentary tracks, including one by Hunter S. Thompson himself that makes the CE a must-have for Thompson fans. Throughout the film Hunter insults Terry Gilliam, screams randomly, audibly smokes weed, and tries to call cast members when he's bored. Yet for all his randomness, he remembers that Johnny Depp is using audio from the anti-drug law enforcement movie-in-a-movie on his answering machine and calls Depp's answering machine to prove it and Hunter times it almost perfectly to sync up the film and the machine.
- Dyeing for Your Art: Johnny Depp had his head shaved to match Thompson's male-pattern baldness. By Thompson. With a straight razor. While Thompson wore a miner's helmet.
- Mid-Development Genre Shift: It was originally just going to be a straight series of articles covering a motorcycle race in Las Vegas, before becoming the weird, wacky, genre-defining whatever-it-is that it became.
- Reality Subtext: As Roger Ebert noted in his review, Johnny Depp was once arrested for trashing a hotel room in New York, as Raoul and Dr. Gonzo do. He questioned how Depp could have found any humour in the story, especially considering that River Phoenix died of an overdose outside the club Depp formerly owned.
- Referenced by...:
- The Avenged Sevenfold song "Bat Country" is basically a continuous series of references to the book/film. The song title is from the line "We can't stop here. This is bat country.".
- Rango has a scene where Rango (also played by Johnny Depp) hits the windshield of the famous car driven by Hunter Thompson (also played by Johnny Depp). Depp also claimed that some of Rango's more outlandish behavior was based on Thomspson. The character's crooked neck is even based on the famous poster for this movie.
- Jazzpunk has a couple of tourists at the Kai Tak Resort level that are basically walking visual Expies of Raoul Duke.
- Panic! at the Disco's fourth album is named Too Weird to Live, Too Rare to Die!.
- Saved from Development Hell: There had been plans to adapt the book into a film since the late 1970s.
- Throw It In!:
- Benicio del Toro improvised the part in the beginning in the car when he licked the spilt cocaine off the suitcase.
- Gary Busey improvised the "Give me a kiss" line. The producers and Hunter S. Thompson were initially horrified by it, but Terry Gilliam thought it was funny, and left it in the final cut. Thompson said that after a few more viewings, he found the line quite funny.
- Troubled Production: The film had loads of different directors replaced before deciding to hire Gilliam, executives wanting to update the book's setting to The '90s, and no firm budget when starting.
- The writing process also took forever. Alex Cox and Tod Davies wrote a screenplay for the movie, only for it to be disapproved by Hunter S. Thompson himself. Because of that, Gilliam had to write another one in just ten days (though he solved that problem by taking large chunks of the book and writing it in script format. Plus, he had the help of Tony Grisoni). Afterwards, there were problems with the Writers Guild of America after requesting to take Cox and Davies' names off due to their script being heavily rewritten. When Gilliam thought that he might lose the argument, he shot a scene explaining that "no matter what is said in the credits, no writers were involved in the making of the film" as a failsafe. When the decision came to credit him and Grisoni first and Cox and Davies second, Gilliam was mad about sharing credit, later burning his WGA card during a book signing.
- Filming in a casino was hard thanks to having to film between two and six in the morning, not having many extras, and having said extras actually gamble.
- What Could Have Been:
- Bruce Robinson was Johnny Depp's first choice to make the film, but Robinson had quit filmmaking by that point. He would later direct The Rum Diary, based on Hunter S. Thompson's novel and also starring Depp.
- Famed animator Ralph Bakshi wanted to animate a version of Fear and Loathing based on Ralph Steadman's illustrations. Hunter had given the film rights to one of his girlfriends, and couldn't dissuade her from making the live-action film instead.
- According to Robert Rosen's biography of him, in early 1980, just before his recorded comeback, John Lennon read Fear and Loathing and became taken with the idea of playing Raoul Duke in a film version. Though it never eventuated, he referenced the novel in a draft of biographical matter (agreeing with its assessment of his song "Power to the People") and parodied the title twice in his posthumously published Skywriting by Word of Mouth.
- Martin Scorsese and Oliver Stone each tried to get the film off the ground, but were unsuccessful and moved on.
- During the early stages during the initial development hell to get the film made, Jack Nicholson and Marlon Brando were originally considered for Duke and Gonzo, and Nicholson was attached, but they both grew too old. Afterward, Dan Aykroyd and John Belushi were considered for the duo, but that fell apart when Belushi died. John Malkovich was later considered for Duke, but he too grew too old. At one point John Cusack was almost cast, but then Thompson met Johnny Depp, and was convinced no one else could play him. Cusack had previously directed the play version of "Fear and Loathing", with his brother playing Duke.
- Write Who You Know: Hunter S. Thompson based Dr. Gonzo on his friend 'Oscar Zeta Acosta', who is said to have drowned sometime in 1974.
Trivia / Fear and Loathing in Las Vegas