Brandon Auret, who plays "Hippo" in the film, openly admitted his disdain for his co-star Ninja (Watkin Tudor Jones) in an interview. He quoted saying "Everyone knows the relationship that I have with Waddy. I don't care much for him. I don't care much for his band, I don't care much for anything that he does, you know, when somebody comes and feels that they have the right to tell you how to do your job? Yeah, it became an issue."
The word 'zef' is an Afrikaans slang word, which roughly translates to the English word 'common'. Also means 'uncool' in Afrikaans. It differs from the Australian term 'bogan' and the British term 'chav' in that it is mostly a positive term for oneself, rather than a derogatory term for someone else. It is also not typical of the poorest classes of the society, but rather a mostly white, lower-middle class subculture.
When water is dumped on Deon to wake him up, Ninja is wearing a vest with "Bite Me Fanboy", and a stylized winged skull design on the back. This is a nod to the DC comics character Lobo, who often wears an almost identical vest.
Sony edited the Japanese version of the film to PG-12, the Japanese equivalent to a PG-13 rating, and has refused to release an uncut version in Japan. While Sony claims Neill Blomkamp approved the edits, Blomkamp himself says he'd never heard about them until Japanese fans began asking him questions about it.
Ninja was also Neill Blomkamp's first choice to play the lead in Blomkamp's previous feature Elysium (2013), but he turned down the role, reportedly because he didn't want his first screen role to be an American-accented character.
While Deon is figuring out the problem on his new A.I. code, the codes shown on the screen, are actually from Fedora OS Node.c. The same codes are shown, while Chappie is figuring out the problem on his Consciousness codes.
This is the second time Sharlto Copley stars in a Neill Blomkamp feature based in their native South Africa, with the first being District 9 (2009). This is also their third overall co-working as they did so in Elysium (2013).
Michelle (Sigourney Weaver) delivers the lines, "Destroy that robot! Burn it to ash!" This is possibly a reference to her role in Alien (1979) where a thinking robot (named Ash) protected the alien at the expense of the "expendable" crew.
At 22:40 Yo-Landi suggests to cut Deons feet off, Ninja jumps in and remarks, "you can get a Nice funky wheelchair". This is clearly a reference to Harmony Korines Umshini-Wam, where Ninja and Yo-Landi steal some wheelchairs with some mag rims.
This is not Hugh Jackman's first time in a movie dealing with robots. He also starred in Real Steel (2011) (about boxing robots), and in X-Men: Days of Future Past (2014), where the X-Men, including Wolverine, fought giant robots called Sentinels.
Hugh Jackman is mostly known for playing heroic characters. This is a rare occasion where he plays a villain. He has said about his character: "I wouldn't call him an archetypal villain, but I feel he does in a way occupy, in this film, a point of view that is important against artificial intelligence."