Donald Sinden has a brief part as an army despatch rider.
Terence Fisher would direct Herbert Lom again, fourteen years later, in Hammer Studio's version of The Phantom of the Opera (1962)
In real life Herbert Lom was Hungarian-born and of part Jewish extraction, was extremely well educated and could speak Hungarian and Czech as well as German and English. He caught the acting bug in his late teens and fled to England nine months before the outbreak of WWII where he was soon in demand as a film actor due to his ability to convincingly play a range of different nationalities.
Despite playing a character with an 18 year old daughter, Herbert Lom (Mr Hendlmann) was 31 years old at the time of filming and only 8 years older than Mai Zetterling who played his daughter. Yet Sybille Binder, who played Lom's on screen wife Mrs Hendlmann) was 53 years old at the time of filming.
Renee Goddard's debut.