 Fox had spent an estimated $100,000 on the film already when shooting had to be called off.Wanting to salvage something of the situation and reluctant to cast a different actor as Charlie Chan, Sol Wurtzel, head of Fox's B movie unit, had the script rewritten as a Mr. Moto movie.Two Charlie Chan regulars appeared in the film – Keye Luke, who plays Charlie Chan's son Lee, and Harold Huber, who plays Lt Riggs.