Still with Old Mother Riley Meets the Vampire, I was puzzled when near the start of the film it was made clear in dialogue that "the vampire" was not a real vampire but was simply somebody who imagined himself to be a vampire.
I considered that a betrayal of the trust of all the people who saw the film's title, Old Mother Riley Meets the Vampire, and subsequently bought cinema tickets in the expectation of seeing Old Mother Riley meeting a vampire.
However, it appears that the non-reality of the vampire was necessary in order for the film to obtain the "U" certificate that would allow children (Mother Riley's biggest and most numerous fans) to see the film unaccompanied by an adult.
Moving along, it's always a pleasure when watching old films to spot minor actors and extras who later became well-known stars.
I was quite proud of spotting the police constable in the police station and, although he is uncredited, nevertheless identifying him as none other than Friar Tuck from the legendary British TV series "The Adventures of Robin Hood".