Lee Chan(Keye Luke), draws a caricature of himself and a woman he's sweet on in Shanghai. The drawing was actually drawn by Keye Luke, who was an accomplished artist.
While on board ship at the beginning of the film Charlie Chan sings a song for the children, he mentions Emperor Fu Manchu. There never was an Emperor Fu Manchu but Werner Oland Played the character FU Manchu in two films in 1929 and 1930.
The 12th of 47 Charlie Chan movies.
When Charlie is on board the ship he mentions to a ship's officer that he is 60 yrs. old.
Frederick VogedIng's character is actually named lvan Marloff; for some reason the filmmakers were unable to change the name in the final credit listing