The plot of this film has strong similarities to Arsenic and Old Lace (1944), in which both Boris Karloff and Peter Lorre were previously associated - Karloff appeared in the theatrical original (and at least three television adaptations) while Lorre co-starred in the film version.
This is the second of four film teamings of Boris Karloff and Peter Lorre, all of them comedies. Others were You'll Find Out (1940), The Raven (1963) and The Comedy of Terrors (1963).
Shooting lasted July 7-21 1942, released October 22. This completed Boris Karloff's six-picture contract with Columbia.
Part of the SON OF SHOCK package of 20 titles released to television in 1958, which followed the original SHOCK THEATER release of 52 features one year earlier. This was also the last of 11 Columbia titles, the other 61 all being Universals.
Jeff Donnell is credited specifically with a "Miss" in front of her name. She was born Jean, but took on the nickname of Jeff as a youth because she loved the "Mutt & Jeff" comics.