Reginald Owen (Concierge), George Davis (Clerk) and Grace Hayle (Patient) are in studio records for those roles, but they were not seen in the film.
Since John H. Kafka was in Hollywood in the 1940s and even wrote some MGM films, it is not known if his onscreen credit for original story is based on his direct contribution to this film, or was due solely to his work on the original 1938 French version.