Filming went on through the German Blitz. Producer and Director Gabriel Pascal had his own spotter on the roof who blew a horn when he spied German planes. According to Ronald Neame, nobody had told Wendy Hiller, so when the horn sounded during a rehearsal and everybody left, Hiller was bewildered.
Robert Morley was only four years older than screen daughter Wendy Hiller, and eleven years younger than Walter Hudd, who played his son.
According to Ronald Neame, Writer Bernard Shaw never came to the set, and when the movie was screened for him, his only comment was, "Gaby, you astonish me," and then he left.
Writer Bernard Shaw wanted Mrs. Patrick Campbell for the role of Lady Britomart, but the veteran actress turned it down because it would have meant she had to leave her beloved dog Moonbeam behind her in France.