The Lady Vanishes (1938)

Plot hole: When Iris Henderson and her two friends arrive at the hotel, Iris orders dinner and asks that it be sent up to "our" room. The waiter arrives when the three are changing. But later, when it's time for bed, Iris says good night to her friends, who leave her alone in the room (as she must be for the sake of subsequent developments).

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Iris Henderson: I've no regrets. I've been everywhere and done everything. I've eaten caviar at Cannes, sausage rolls at the dogs. I've played baccarat at Biarritz and darts with the rural dean. What is there left for me but marriage?

Trivia: Hitchcock's cameo comes towards the end of the film - he is at Victoria Station wearing a black coat and smoking a cigarette.