Richard Attenborough was a late replacement for James Mason. Attenborough only took the role to get funding for Gandhi (1982) which would take another seven years before it went before the cameras.
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Despite a few small changes made to fit the different cast, the dialogue for this movie is almost word for word identical to the 1965 version.
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The Abbasi Hotel (formerly known as the Shah Abbas Hotel) is a hotel located in Isfahan, Iran. The hotel is in the center of an Iranian city, so the external shots were shot elsewhere. Also filmed in Spain.
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The name of the screenwriter, Peter Welbeck, was a pseudonym for Producer Harry Alan Towers. This was the second adaptation of Dame Agatha Christie's "Ten Little Indians" that Towers had worked on under this alias, having previously co-written Ten Little Indians (1965).
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