A remake of "The Black Camel."
Actor 'Hamilton McFadden', who plays the thankless supporting role of Bill Kellogg, formerly directed three earlier big budget entries in the series: "The Black Camel," (1931), Charlie Chan Carries On" 1931), and "Charlie Chan's Greatest Case" in addition to appearing in "Charlie Chan in Reno" (1939).
Although listed in the credits as "Carlos Dantas", Ted North's character is called "Clark Danton" in the film.
The twenty-ninth of forty-seven Charlie Chan movies.
All the "Brazilians" in this film mispronounce the name of the city to rhyme with English "no". Actual Portuguese speaking Brazilians say "Rio" rhyming with "who".