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=== Hitchcock's cameo ===
[[List of cameo appearances by Alfred Hitchcock|Alfred Hitchcock appears]] about 16 minutes into the film, on the train to Santa Rosa, playing [[Contract Bridge|bridge]] with Doctor and Mrs. Harry. Charlie is traveling on the train under the assumed name of Otis, and is lying down due to a [[migraine]]. Mrs. Harry is eager to help him, but her husband is not interested and keeps playing bridge. Doctor Harry replies to Hitchcock that he does not look well while Hitchcock is holding a full suit of spades, the best hand for bridge.<ref>{{cite web |url=https://catalog.afi.com/Film/657-SHADOW-OF-A-DOUBT |title=Shadow of a Doubt |website=[[American Film Institute]]}}</ref>