Charade

Factual error: The sign outside the embassy reads "American Embassy", it should read "Embassy of the United States of America". North & South America are continents, not a country.

Sacha

Continuity mistake: When James Coburn is about to leave the phone booth where he's been lighting matches, the number of matches he leaves on the top of the phone changes between shots.

Sacha

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Reggie Lampert: Well, wasn't it Shakespeare that said, "When strangers do meet in far off lands, they should e'er long see each other again"?
Peter Joshua: Shakespeare never said that!
Reggie Lampert: How do you know?
Peter Joshua: It's terrible. You just made it up.

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Answer: Grant is secretly investigating the case and already knows that Carson Dyle is not dead, and has probably figured out how Reggie (Hepburn) knew that fact or else it doesn't matter overall to his investigation.

raywest

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