When the plotters arrive at the cottage to change over the teachers, the car pulls in, but when they go to dump the body, the car is facing the opposite direction.
When Capt. Hardt sits down to study the map provided by Lt. Ashington, there is a book lying on top of the map. But on the closeup of Capt. Hardt studying the map, the book has now changed position.
When Captain Hardt looks down at the British fleet from the house, the view that is shown from his binoculars is one from sea level, not the view one would expect from a high vantage point.
In the German submarine, the officers refer to depths in feet, and the depth gauge is calibrated in feet. On a German ship, depths would be measured in meters.
Ashington is constantly referred to as Commander but he wears the two rings of a Lieutenant on his sleeve. This may be because he is impersonating a traitor who was demoted to Lieutenant.
There has never been a HMS Connaught in the British Navy.
Identified in the credits and on her passport signature as "Anne Burnett", the newspaper report of the teacher's Orkney appointment misnames her as "Ann Burnett", though this passes entirely without comment.
Early in the film the sniper is wearing a 1930s German helmet, not a 1910s helmet.
Set in 1917, the spy's motorcycle in a c.1925 Triumph model P.
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