Elizabeth Patterson played the role of Susan in both this and the first sound version of the story, The Cat Creeps.
In the original Broadway play and the 1927 film, the dead man was named Cyrus West. In this version the dead man is named Cyrus Norman, possibly because Mae West was still making films at this time.
Many people believe that the lawyer's name (Crosby) is an in-joke reference to the Bob Hope/Bing Crosby pairing. In fact, it's a coincidence; this was the character's name in the stage play as well as the two previous film versions. Moreover, Hope and Crosby did not make a film together until Road to Singapore the following year.
Miss Lu is the character that was named Mammy Plessant in the 1922 Broadway play and the 1927 film (The Cat and the Canary).
One of over 700 Paramount productions, filmed between 1929 and 1949, that were sold to MCA/Universal in 1958 for television distribution, and have been owned and controlled by Universal ever since. Because of legal complications, this particular title was not included in the original television package and was not televised until several years later.