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Continuity mistake: With Dr. King at his side, Poirot waves hi to Hassan, the 'Arab boy'. The position of Poirot's hat and cane is different in the two shots; in front of him, or down his left hip. (01:14:55)
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Continuity mistake: Inside Lord Peel's study, Poirot asks Lady Westholme what did she do after lunch, since "You did not immediately go for your walk, I believe." Peter Ustinov poses the question with his hands behind his back, but Lauren Bacall's answer answers with the stand-in for Ustinov posing with his hand on his hip. (00:54:40)