A few observations about race, phrenology and Charlie Chan
I found it a little distracting when the film starts with Charlie Chan arguing against States' Rights. I am just kidding of course, but Sidney Toler so embodied the role of the Chinese detective that it is difficult to separate him from that role.
Early in the film, note the references to phrenology.
The references to slavery and the characterizations of some slaves are rather offensive, unintentionally revealing attitudes toward race in 1936.