- This movie marked the film debut of James Cromwell.
- Orson Welles was originally considered for the role of Inspector Wang but was unable to accept because he was appearing in a play in Italy.
- Neil Simon remained on the set to take care of re-writes, as he did with this picture's sequel, Cheap Detective, The (1978). Simon took such a shine to Alec Guinness during the picture's production that he told him if he did not like anything in the film, he'd immediately rewrite it for him, but Guinness assured him it was great fun for him.
- Orson Welles had been asked to play Sidney Wang before Peter Sellers got the part.
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