Errol Flynn was criticized for playing heroes in World War II movies. Tony Thomas in his book 'Errol Flynn: The Spy Who Never Was' states that Flynn had tried to enlist in every branch of any armed services he could but was rejected as unfit for service on the grounds of his health. Flynn had a heart condition, tuberculosis, malaria and a back problem. Flynn felt he could contribute to America's war effort by appearing in such films as Edge of Darkness; Northern Pursuit; Dive Bomber, Objective, Burma!, and Uncertain Glory. Reportedly, Flynn was at his most professional and co-operative he ever was whilst working on Second World War movies. The studios apparently did not diffuse the criticism of Flynn's state-of-health as they wished to keep it quiet for fear of his box-office draw waning.
Several cast members in studio records/casting call lists did not appear or were not identifiable in the movie. These were (with their character names): Charles La Torre (Restaurant Keeper), Adele St. Mauer (Woman on Bus), Sarah Padden (Peasant Woman on Bus), Art Miles (Bus Driver), Trevor Bardette (First Passenger on Train) and Michael Mark (Second Passenger on Train).