Trivia: Vintage aircraft fans do not hold this film in very high regard. During filming a perfectly serviceable Mosquito was wrecked deliberately for a crash scene. Considering the scarcity of flying Mossies it's considered almost a criminal act in the vintage aviation world.
Trivia: All of the members of the Norwegian resistance movement (the Ling) are ambushed and wiped out by the Germans on their way to attack the defences. This would suggest that Erik Bergman must have broken under torture and given the information about the upcoming attacks to the Germans - allowing them to know where and when to ambush the resistance men. So the Wing Commander's murder mission was a waste of effort (or at least too late).
Trivia: Two Mosquitos, able to run under their own power, were destroyed during the making of this movie. One that collided with a fuel truck and one that had its landing gear folded in, while running. The later was filmed from two angles, portrying two different crashes. This movie was made before the movement to preserve old aircraft started.