In the previous episode, after the recorded accusations have been heard and Rogers tells his story about Miss Brady, Miss Brent states that she believes him. In this episode, however, when she and Miss Claythorne are winding wool, she states that she finds Rogers' story "most dubious". Nothing has happened in the interim to explain her change in attitude, and she has no reason to lie in either case.
The positions of Armstrong's body and hands change between shots after Wargrave states that the killer is one of the remaining seven.
Where is the electric power for the lights coming from? Haven't seen a generator anywhere, nor evidence of cables from the mainland.
Blore calls his victim, James Stephen Landor, as "Edward Landor" while talking to Lombard.