De Beers Group, which is the largest player in the diamond trade, has expressed reservations that the film will reduce public demand for diamonds. De Beers maintains the trade in conflict diamonds has been reduced from 4% to 1% by the Kimberley Process and it has been suggested the company pushed for the film to contain a disclaimer saying the events are fictional and in the past. De Beers has denied this.
The attack helicopter seen near the end of the film is a Mi-24 SuperHind Mk IV. The helicopter started life as a Russian Mi-24 (NATO designation "Hind") but underwent an extensive upgrade program by Advanced Technology and Engineering, a South African arms company. Upgrades include improvements to avionics, weapons systems, and counter measures.
When Archer (DiCaprio) meets with Coetzee (Vosloo) at the latter's ranch a dog is shown. That dog is a Rhodesian Ridgeback, a breed of dog that was bred in the late 1800's in the then Rhodesian territory, today largely part of the country Zimbabwe.
The trivia items below may give away important plot points.
At the end of the film, Solomon Vandy addresses a conference on blood diamonds in Kimberley, South Africa, describing his experiences. This conference actually took place in Kimberley in 2000. The conference resulted in the Kimberley Process Certification Scheme, a system now used by diamond traders to certify the origin of diamonds, in order to curb the trade and sale of conflict diamonds.
According to Time Magazine (March 2, 2007), a computer generated tear was added to Jennifer Connelly's face in the scene were she is conversing on a cell phone with Leonardo Dicaprio's character, at the end of the movie.