Another point from “The Art of Hitchcock”:
“As in ‘The Man Who Knew Too Much’ and ‘The 39 Steps,’ the politics are again vague, but here the reason was as much the restrictions of British censorship as much as the writers’ deliberate ambiguity: In 1937 and 1938, English films had to maintain a steadfast neutrality about events in Germany and about German expansion throughout Europe. But this requirement paradoxically freed ‘The Lady Vanishes.’ Instead of serving a specific politic, the film became a tightly woven tale in which all appearances are deceiving and characters are sprung free for new relationships.”
