When Schleifer enters the girls' accommodation, you can see that there's a long corridor both ways. But when Schleifer and Basti leave the room through the windows, they immediately reach a corner at the building.
Before the maneuver, the guys of Stube 54 arrive at the scene dressed in normal combat uniform. But when Jana volunteers to be the hostage, Lämmle is suddenly shown wearing the helmet with signal lights used for the maneuver.
Contrary to Major Hauptmann's claim that Luxembourg doesn't have a secret service, the country does in fact have one, which is the "Service de Renseignement de l'État".