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Trivia: When Sherlock rides a mule - he hates horses - an adaptation of Ennio Morricone's "Two Mules For Sister Sara" is played, a film in which Shirley Maclaine, playing a fake nun, rides a mule through most of the film.

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Continuity mistake: Sherlock looks at the ring of a murdered man, who was killed in a blast along with about a dozen other men in Paris, and the ring was plain. But later, the ring is shown again, and this time it has the letter M on it, a large letter, and it is very ornate - nothing like the other ring.

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