The opening scenes of this movie have, as background music, the melody of the Gershwin song, A Foggy Day in London Town. This, despite the fact that there is no fog in those scenes. The song was introduced by Fred Astaire -- who plays a supporting role in this flick -- in his 1937 movie Damsel in Distress.
SPOILER: The concluding scenes, which include a chase on the beach at Penzance, has background music from the Gilbert & Sullivan operetta, The Pirates of Penzance (which was also made into two movies in 1982 and 1983), with a coda from a melody in Gilbert & Sullivan's HMS Pinafore. One other mystery movie in which music from the Pirates of Penzance was significant was The Hand That Rocks The Cradle.
SPOILER: The concluding scenes, which include a chase on the beach at Penzance, has background music from the Gilbert & Sullivan operetta, The Pirates of Penzance (which was also made into two movies in 1982 and 1983), with a coda from a melody in Gilbert & Sullivan's HMS Pinafore. One other mystery movie in which music from the Pirates of Penzance was significant was The Hand That Rocks The Cradle.