This is the first time a major English adaptation of the story uses the surname MacArthur for the General (Sam Neill). The General's name was changed to either MacKenzie or Mandrake for the stage and early screen to avoid referencing WWII hero, General Douglas MacArthur.
The soldier figurine designs were inspired by the characters themselves; a deliberate move by the art direction. (e.g. The figurine representing Mrs. Rogers is weakly sculpted and hunched, the Lombard figure is stacked and protruding, commanding-like.)
When Audrey is typing the invitations, the letterhead on the papers shows that the name of the house on Soldier Island is India House. For most of the years the novel has been in print, the island's name was Indian Island, and the poem referred to ten little "Indians".
Promotional material prior to the show's airing revealed plot devices later dropped from the final production, including a promo shot of Vera Claythorne (Maeve Dermody) in her room with seaweed hanging from the hook. This is directly from the book where seaweed was used as a planted distraction. This scene is changed in the show, resulting in a plot hole where there is no deliberate distraction planted for the killer's mechanics to work, and is left to chance instead. A promotional photo first shown in an article on telegraph.co.uk showed two actors as Sir Thomas Legge and Inspector Maine from the book's epilogue, which was deleted for the show.
And Then There Were None was the first Agatha Christie novel that screenwriter Sarah Phelps read. She admitted that she had never read any of Agatha Christie's stories, nor had she ever watched any Agatha Christie film or TV adaptions prior to this job.
The character of Anthony Marston (Douglas Booth) had previously been changed to a Russian Prince (1945), a pop singer (1965), and a French crooner (1974). He was named Anthony Marston in the 1989 version, and this is the first version where his victims are children.
The GWR open carriage used by some of the characters to travel to the embarkation point is Carriage 650 from the Severn Valley Railway originally built in 1913. It was restored by the SVR Great Western Association and was the Overall Winner of the Heritage Railway Association Carriage and Wagon Award 2015.
The ending is different from the novel. In the novel, Wargreave doesn't confront Vera before she dies. Instead there is an epilogue with two police officers investigating the massacre and, as 5he Judge predicted, being baffled by who may have done it. The judges culpability is discovered from a message in a bottle where he confesses to the crime out of a sense of vanity. The idea of work Reeve confronting his final victim is taken from the stage play, which was also written by Agatha Christie. She change the ending because she felt that the one from the novel would not work well on stage.
The trivia items below may give away important plot points.
This is the first and only English adaptation of the story which follows the ending of the original novel. All previous productions followed the stage play except for the Soviet version Ten Little Indians (1987).
Noah Taylor, Burn Gorman, and Charles Dance all played characters in Game of Thrones (2011) that met their gruesome deaths during Season 4. Dance's Tywin Lannister is killed by his son Tyrion with a crossbow during episode 10 "The Children". Taylor's Locke has his neck broken by the half-giant Hodor who Bran Stark had warged into during episode 5 "First of his Name". Gorman's Karl Tanner also meets his end during episode 5 when Jon Snow stabs him through the head with his sword. Consequently they all meet their ends in the same order as their characters in "And Then There Were None"; Noah Taylor first, Burn Gorman after and Charles Dance last.
In addition to Noah Taylor, Burn Gorman, and Charles Dance having roles in this and 'Game of Thrones' (2011), their character roles are very similar to one another between both series. Noah Taylor plays manservant Rogers, and subordinate named Locke in Game of Thrones, who is subservient to Roose Bolton. Burn Gorman plays corrupt cop Blore, and an ex-criminal watchman Karl Tanner, a member of the Nights Watch which polices over The Wall. Lastly, Charles Dance plays Judge Wargrave, and also Tywin Lannister who prominently presides over court in the trial of his son, Tyrion.