Preparing for the role of Jan Baalsrud, Thomas Gullestad practiced looking cold in front of a mirror. After filming, Thomas admitted during a radio interview that it was not necessary. Looking cold came very naturally while filming as it was, in fact, very cold.
During filming on location at Lyngseidet, two Italian skiing tourists was caught in a big avalanche in the mountain nearby the set. It was in the very same mountains and during the very same time of year that Jan Baalsrud made his long escape from the German occupiers. At the time of his escape, he was well aware of the dangers of avalanches and the risk he took in the same areas.