This is the first adaptation of Agatha Christie's story which follows the novel's original ending.
This is the only adaptation of Agatha Christie's novel not to change any of the characters, or the details of any of their past crimes.
Although it looks like the film was shot on an actual island with a mansion, it is far from the truth. The production was shot in Crimea, utilizing the peninsula's two famous mansions, the Swallow's Nest and the Vorontsov Estate. Both houses were situated on large, circular cliffs that Crimea is famous for, thus creating the illusion of an island. However, when the house is seen in the exterior scenes, it is actually a scale model, shot with actors using forced perspective.
Emily Brent's Lyudmila Maksakova line about the termites in the house, and telling Vera that her past only concerns her as much as she lets it, are lines taken from Agatha Christie's play, The Mousetrap.
The original (Russian) title of the movie is translated as "Ten little Negroes", with the word "Negro" carrying no negative connotation in the Russian language. The word "Nigger" in Russian always carried the offensive, American meaning and thus the play was always translated this way to align more with the original British version.