The routine that Mantan Moreland does with Haywood Jones is a partial recreation of Moreland's nightclub act, "Indefinite Talk," in which two characters anticipate each other's dialogue. Moreland did this with numerous partners, most notably with Ben Carter.
The forty-third of forty-seven Charlie Chan movies.
Only film of Haywood Jones.
There seems to be more African-American actors that usual for a late 40s Hollywood B-movie, especially in the scenes with the factory workers and passers-by in the street.