In an interview on the BBC Breakfast programme, Noomi Rapace stated she prepared for seven months for her role. She was on a strict diet, took kick boxing lessons, and had her eyebrow and nose pierced.
The Swedish title "Män Som Hatar Kvinnor" actually translates as "Men Who Hate Women".
All music for this film and its 2 sequels was recorded in just 4 days. According to composer Jacob Groth, the note sheets for the orchestra weighed 33 kilos (72 pounds).