Factual error: Charlie Chan claims that mixing hydrochloric acid with ferrocyanide of potassium is mixing two acids. Ferrocyanide of potassium is not an acid. (00:27:00)
Charlie Chan at the Opera (1936)
1 mistake
Directed by: H. Bruce Humberstone
Starring: Boris Karloff, Keye Luke, Charlotte Henry, Warner Oland
Charlie Chan: Man who ride on merry-go-round often enough finally catch brass ring.
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