- The film was performed by director Neil Blomkamp based on his short film "Aliens in Johannesburg". The film is also Neil Blomkamp's first feature film.
- The title of the film is based on a recent rumor in the United States. For decades, it has been rumored that the United States has the 51st area, which is responsible for handling alien affairs, but this news has not been officially recognized. The meaning of "District Ninth" also alludes to "District 51".
- The idea for the film originated from the experience of director Neil Blomkamp when he was young in South Africa during apartheid.
- The film was shot on-site in a slum in Africa.
- The film was originally planned to be released in North America in the spring, but after consideration, the producer Sony decided that the film was sufficient to attract a large audience, so it increased its investment in the film, and the film's release time was also changed in the summer.
- Most of the scenes in the film where animals dismember corpses are real, and the slums of Africa are like that.
- In the process of filming the movie, probably six completely different ending ideas were created.
- A large number of real weapons in the troops of African countries were used in the filming of the film, so most of the guns that appear in the film are real.
- The production cost of "The Ninth District" was US$30 million, while the cost of "Transformers" was US$200 million.
- The story of the protagonist Wikus becoming an alien in the film refers to Kafka's "The Metamorphosis."
- The film is one of two films released in 2009 based on the 2005 short film, and the other is Shin Aker's "9". Both films were adapted and directed by the director of the original short film.
- Three years later, 2012, the year of the end of the world predicted by the Mayans.
- The aliens in the film are called "prawns". Coincidentally, in the Rwanda massacre, the Hutu people called the Tutsi "cockroaches". Therefore, the theme is similar to the "Rwanda Hotel".
District 9 behind the scenes gags
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Christopher Johnson's Son: Fuel goes in here!
Christopher Johnson: That's enough! QUIET!
Christopher Johnson's Son: ...then we fly away.
Christopher Johnson: I said QUIET! We cannot trust him.
Wikus Van De Merwe: What is he saying about the fuel, is this, are you trying to start this thing? He-he. Are you little fookers trying to start this, and get away, ay?
Christopher Johnson: Never mind.
Wikus Van De Merwe: Ha-ha. Yeah, you sneaky fookin' prawns, heh?
Christopher Johnson: Too bad. I could have fixed you.
Wikus Van De Merwe: Wha- wait what did you say about-about the *fixing*?
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[Wikus enters an MNU code and the gate opens]
[an MNU agent shoots several bullets at Wikus, causing him to pull the trigger of his Alien gun and shoot the agent]
Christopher Johnson: [the MNU agent explodes] Fuck!
[Wikus takes off his mask and checks his vest]
Christopher Johnson: I thought you said not to kill them?
Wikus Van De Merwe: He shot at me!