The 39th of 47 Charlie Chan movies.
Charlie Chan does not wear his usual birthstone ring.
Sidney Toler was struggling with cancer during the filming and was clearly becoming increasingly tired and frail. According to Mantan Moreland, Toler gallantly refused to leave the series. Moreland claimed that: "Mr. Toler couldn't stand for very long and had to rest a lot. I told him he should be in a hospital. And he said to me, 'Manny, if I quit the picture I'll put all these people, including you, out of work.'"