Continuity mistake: The dead body Wally discovers in the house has its head straight in the long shots, but canted to the right in the close ups.
Revealing mistake: The wide shot of the exterior of Drearcliffe House is a recycling of the wide shot of the church where Meade and his Nazi colleagues were hiding in "Sherlock Holmes and the Voice of Terror." It can't be the same place, as the mansion is located in Scotland and the church in England. (00:01:21)