While director Robert Day and the make-up man were discussing how to achieve Boris Karloff's metamorphosis without undue complication or expense, the actor volunteered that he could achieve the effect by taking out his dentures, which he had also done when he played Frankenstein's monster.
One scene shows an evidence box marked Constance Kent, the child murderer who was found guilty in 1865 of killing Francis Kent at Road Hill House in Wiltshire. Spared the death sentence, she was released in 1885 and emigrated to Australia, where she died in 1944 aged 100 years old.
Producer John Croydon first met Boris Karloff on the set of The Ghoul (1933) 25 years earlier as a tea boy.
Elizabeth Allan and Diane Aubrey play mother and daughter; it is the former's final theatrical film and the latter's first.
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