The Germans take a prisoner out in the woods to be executed. A German officer ties the prisoner's arms behind him, around a tree. When the prisoner is shot, he falls forward and away from the tree as if his arms were not bound.
During the British attack and rescue, several real-life clips (showing ships at sea, explosions, etc) are shown twice.
Three men are seen to leave the aircraft through the door, but the shot from underneath the plane shows four parachutists.
When Sergeant Hall arrives at Owens' room, he is wearing his helmet. He would not to be wearing his helmet indoors in this venue, and should be wearing a forage cap (like the orderly who arrives alter) with his helmet attached to a bag containing his gas-mask.
The commandos twice hide from a plane that it searching for them. This plane is a DC-3/ C-47 with a British roundel. The Germans did not fly this model of aircraft.
The office in the prison shows a world map with the Western hemisphere shown centrally, rather than central Europe, indicating the U.S. origin of the production and crew.
The Douglas DC-3 lacks military markings and camouflage painting.
At exactly 9 minutes and 14 seconds, you can clearly hear someone coughing on the set. Another voice is heard coughing again 5 seconds later.
The German troops looking for the commandos in the forest fail to see their tracks despite the fact that they are walking in snow.
The messenger who arrives at the hotel with the orders is a sergeant but Owens refers to him as 'Orderly'. This term was only used for privates. Owens should have referred to him as 'Sergeant'.