The Lady Vanishes (1938)

Continuity mistake: When Iris, Gilbert and Dr. Hartz are together in the dining car, they order three drinks, one for each of them. Gilbert swallows his in one gulp. A minute later, Dr. Hartz proposes a toast, and all three of them guzzle their drinks. Where did Gilbert get another glass of brandy?

Iris Henderson: You're the most contemptible person I've ever met in all my life.
Gilbert: Confidentially, I think you're a bit of a stinker, too.

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