Naming the residents of the isolated castle Manderley is an obvious reference the the mansion of Rebecca from two years earlier.
The exterior of the hotel would later be dressed as the saloon for The Ox-Bow Incident.
The thirtieth of forty-seven Charlie Chan movies.
This was the last Charlie Chan movie produced by 20th Century Fox Studios, for America's entry into World War II in December 1941, shortly after this movie was filmed, made the studio cut back on film productions for the war effort.