Eddie Albert's part in this film (as a US Air Force major) is one of several military roles he played in his earlier career. These were satirized in the TV series 'Green Acres', when it is explained that Oliver, his character, served as US pilot in WWII and was shot down over Hungary, where he was rescued by his future wife Lisa.
Paul Massie, Canadian, and John Crawford, American, both worked primarily in British films during this time, and would soon have their biggest roles in Hammer Productions: Massie as the lead (or leads) in "The Two Faces of Dr. Jekyll" and Crawford the main villain in "Hell Is a City".
Final film of Ann Walford.
First major screenwriting credit for the British film critic Paul Dehn, although he had previously devised the story-line for "Seven Days To Noon" (actually scripted by Frank Harvey) with his partner James Bernard and also provided commentary for documentaries. At the time the film was made, he was still the film critic of the "News Chronicle" newspaper. He was a good choice to write the film, as he had been heavily involved in espionage activities throughout World War II.