Before the Universal Pictures logo: PRODUCER'S NOTE: - Karloff, the mad butler in this production, is the same Karloff who created the part of the mechanical monster in "Frankenstein". We explain this to settle all disputes in advance, even though such disputes are a tribute to his great versatility
The opening credit reads "J. B. Priestly" but should read "J. B. Priestley". The source novel by him is Benighted, published in 1927 and now in the public domain. Priestley is arguably best known for his stage play An Inspector Calls, one of his "Time Plays".