- Acting for Two: John Malkovich plays himself, but also plays Craig, when he's permanently taken over Malkovich's body and assumed his identity. And then he plays Lester once Craig has been kicked out.
- Actor-Shared Background: Shortly before cast in the film, Malkovich told Charlie Kaufman that he, himself, has once lived in an apartment building with a 7½th floor.
- Ascended Fanon: After Get Out was released, fans started comparing the plots, making Wild Mass Guesses that they took place in the same universe, and the 2017 horror film was secretly a sequel to the 1999 fantasy. After hearing this theory, the directors of both movies met, spoke at length, and publicly stated that though Get Out was never conceived as a sequel to Being John Malkovich, they enthusiastically decided that the films are a Shared Universe; "as far as I'm concerned, it's true." The director of Get Out actually hopes to cast Malkovich in a sequel, stating that it would be "cool" to "do the full trilogy."
- Awesome, Dear Boy: Charlie Sheen was in rehab when he heard about the project. He signed on without reading the script.
- Breakthrough Hit: For Spike Jonze.
- California Doubling: The whole movie was shot in L.A., but set in New York. When Lotte falls out onto the New Jersey Turnpike for the second time, look in the background for some palm trees that shouldn't exist.
- The Danza (but very easy to mistake for As Himself): John Malkovich as John Malkovich. The former has said the latter bears "only the faintest resemblance" to himself. Among other differences, his middle name is changed (from Gavin to Horatio), he really had never been in "that jewel thief movie" at the time, and he doesn't live in New York.
- Defictionalization. A lot of people in the film compliment John Malkovich for his role as a jewel thief. However, as the character repeatedly pointed out, he'd never played a jewel thief by 1999. In 2003, he played a jewel thief in Johnny English.
- Dyeing for Your Art: One of the more memorable aspects of this film is that it cast John Cusack and Cameron Diaz—two of the most iconic actors in Hollywood at the time—and managed to make both of them practically unrecognizable. Cusack appears with ponytail-length hair, a full-grown beard and nebbish glasses, while Diaz appears as a homely, frizzy-haired brunette. The makeup artists personally said that making Diaz look unattractive was one of the most challenging parts of the movie.
- He Also Did: Michael Stipe of R.E.M. produced the movie.
- Urban Legend of Zelda: A persistent rumor about the scene where Malkovich is hit in the head by a drive-by beer canning claims it wasn't in the script, and was the result of a drunk extra having some fun while the camera happened to be rolling. As it turns out, it was in the script and the rumor was the result of fake director's commentary.
- What Could Have Been: If the movie itself made you raise an eyebrow or three, check out the original version of the script. Your head could conceivably explode trying to fathom it ever working on screen. And the movie had Malkovichworld, so that's saying something. Additionally, had Malkovich turned down the role, the film would most likely have been titled Being Steve Buscemi.
- Specifically, the original script involves Craig cross-dressing in various female puppeteering jobs, the Great Mantini challenging Malkovich to a dramatic acting duel, Lester leading a Satanic cult bent on using Malkovich to take over the world (and succeeding), and Lotte marrying the chimp.
- Charlie Kaufman said that at least one studio (being New Line Cinema) offered to fund the movie had he changed it to Being Tom Cruise. Might cross over into Hilarious in Hindsight, if one considers Cruise's behavior from around 2005-2008.
- The original script has Kevin Bacon in place of Charlie Sheen, as Malkovich's actor friend. Malkovich recommended Sheen for the part.
Trivia / Being John Malkovich