In an episode that takes places in 1936, the Rodgers/Hammerstein tune "Edelweiss" is heard. This tune was not composed until 1957.
The inside of the church has the boards with the numbers of the songs that will be sung during the service. These numbers are taken from the official book of church songs introduced in the early 1950s. That is, in the 1920s to 1940s these numbers should have been different to be in accordance with the songs actually sung.