Mrs. Rogers' (Anna Maxwell Martin) sunglasses are likely a reference to portrayal of the same character by Maria Rohm in Ten Little Indians (1974).
Blore's handwritten note next to Mrs. Rogers' name reads "scared of shadow". This is also what Vera thinks (almost verbatim) when she first meets Mrs. Rogers in the novel.
Both the novel and this adaptation have Dr. Armstrong shown the eight remaining figures by another character. Here, it's Vera; in the novel, it's Rogers.
The first names of Blore, Miss Claythorne, General MacArthur, or Wargrave are not used until the accusation recording is played, nearly 33 minutes into the episode.