Character mistake: When Cary Grant holds up a picture in the hotel room, he says, "he's assembling the General Assembly today" instead of addressing the General Assembly. (00:30:00)
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North by Northwest (1959)
1 character mistake
Directed by: Alfred Hitchcock
Starring: James Mason, Cary Grant, Martin Landau, Eva Marie Saint
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Revealing mistake: In the shooting scene in the Mount Rushmore cafe, a boy in the background puts his fingers in his ears, because he knows the gun is about to be shot.
Roger Thornhill: The moment I meet an attractive woman, I have to start pretending I have no desire to make love to her.
Eve Kendall: What makes you think you have to conceal it?
Roger Thornhill: She might find the idea objectionable.
Eve Kendall: Then again, she might not.
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Trivia: Alfred Hitchcock's cameo comes at the end of the opening credits. He can be seen missing the bus.
Question: Why do the kidnappers take Thornhill to the Townsend home and pretend to be Lester Townsend and members of his household? They could have taken him to some obscure place instead, at less risk of being found out.
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Answer: More than likely, they felt that Roger would be dead and they would not be found out. The fact that he survives their DUI plot and returns to the house with the police only serves to makes him look more suspicious and guilty. It's to move the plot along, nothing more.
ChiChi
The bigger plot hole is, if Van Dam really believes Roger is Kaplan, why would he think that Roger would bring the police and go through the trouble of preparing "Mrs. Kaplan" to make the police think he's crazy? If Roger really was a spy, he doesn't need help from the police and would have just disappeared instead of retracing his steps. So if Van Dam anticipated the actions taken by Roger, he must believe at some level that Roger is telling the truth and would have looked deeper into it.