The bomb that Cuffy and the ghost want to dispose of was known as a "blockbuster", so-called because it was so powerful it could demolish more than a dozen buildings i.e. a city block.
This is the 2nd film that Robert Young was in with Margaret O'Brien. The 1st was "Journey for Margaret" (1942). Both of them took place in England around WWII and in both he played an American and she was British.
Original literary work: 'The Canterville Ghost", short story by Oscar Wilde in 'The Court and Society Review', published in two parts on 23-2 and 2-3-1887.
After 38 days of shooting, director Jules Dassin replaced Norman Z. McLeod. Although a news item stated it was due to a "difference of opinion," many believe it was done on the insistence of Charles Laughton. At the same time, William H. Daniels replaced Robert Planck as director of photography.
"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie on
June 18, 1945 with Charles Laughton and Margaret O'Brien reprising their film roles.