The mysterious voice that accuses the invited guests of their specific crimes is an uncredited Christopher Lee.
Producer Harry Alan Towers was unable to film in the U.K. due to an outstanding arrest warrant, so he made this in Ireland. To save costs, he eschewed using Ardmore Studios and leased a rundown mansion, Kenure House, in Rush, County Dublin, as his base.
Original release prints included a "Whodunit Break," a 60-second recap of previous events, after the last two characters discover the body of Mr. Owen's eighth victim. The "Whodunit Break" is missing from most subsequent prints.
The poem: Ten little Indian boys went out to dine; One choked his little self and then there were Nine. Nine little Indian boys sat up very late; One overslept himself and then there were Eight. Eight little Indian boys travelling in Devon; One said he'd stay there and then there were Seven. Seven little Indian boys chopping up sticks; One chopped himself in halves and then there were Six. Six little Indian boys playing with a hive; A bumblebee stung one and then there were Five. Five little Indian boys going in for law; One got into Chancery and then there were Four. Four little Indian boys going out to sea; A red herring swallowed one and then there were Three. Three little Indian boys walking in the Zoo; A big bear hugged one and then there were Two. Two little Indian boys were out in the sun; One got all frizzled up and then there was one*. One little Indian boy left all alone; He went out and hanged himself and then there were none. (*In some versions Two Little Indian boys playing with a gun; One shot the other and then there was one.)
Director George Pollock directed four movies with Margaret Rutherford as Agatha Christie's Jane Marple. When a fifth planned Marple movie failed to be green-lit, he did this classic Christie story for another producer. It was his final theatrical movie.