Director Susanne Bier thought 'Connie Nielsen''s accent was more Swedish than Danish and made her take Danish lesson. Nielsen has been living in the USA for many years, and didn't speak Danish in her everyday life, but the result of the lessons turned out to be pretty good (though, still with a little accent).
Susanne Bier requested that the actors use as little makeup as possible.
Sitting in the first two rows in the church, all but actor Niels Olsen, who plays Colonel Allentoft, are real army officers in their own uniforms.
In the scene where Jannik (Nikolaj Lie Kaas) is told that his brother is dead he is not acting drunk, he is drunk. He thought the scene should be as convincing as possible so decided to do the scene drunk.
Along with "Kongekabale", this was the most successful and best reviewed Danish film of the year in its native country. However, neither of these two films was submitted to the Oscars as the Foreign Film from Denmark. A jury decided to sent a documentary film, "De fem benspænd", which had only been attended by 12,532 people in Danish theaters. This story made headlines, and Danish film producers officially stated that they would force the jury to pick "Brødre" or "Kongekabale" in stead. The jury would not reconsider, and "De fem benspænd" was sent to the Oscars. It was not among the eventual nominees for Best Foreign Language Film. "Brødre" later won several awards across the world, including at the Sundance Film Festival, and opened to stellar reviews in the US. The jury later admitted that they possibly chose the wrong film to send to the Oscars that year.