The actors playing the German football-team are football players in real life, too.
Andreas "Obel" Obering, who plays radio-reporter Herbert Zimmermann, was a member of the German comedy-duo "Till and Obel".
Director Sönke Wortmann played football himself in the second football-league in germany for SpVgg Erkenschwick and Westfalia Herne.
After a private sneak preview in August 2003, director Sönke Wortmann and Rudi Völler, coach of the German national soccer team in 2003, discussed alluring Helmut Rahn (former goalgetter and scorer of the important last goal in Bern), who lived reclusively, to the official premiere of the movie. Rahn died the same night.
The man who introduces the new shoes (with screw-on spikes) to the coach is initially referred as "Adi". Later, his last name is revealed as "Dassler". He was the founder of Adidas, the sports wear company.
While the Lubanski family part of the story is completely fictional, many historic details related to soccer (letters, game results, three players stealing away from training camp, on-the-spot-reports, Adi Dassler etc.) are historical accurate.
Sönke Wortmann wanted to invite the real Helmut Rahn to the movie's premiere, but learned that he had died the same day.