Goof - Anachronsim: Marple: (To the taxi driver) The train station, not the police station, please.
There's no way Miss Marple would have used this expression in the late 1940s or 50s; the expression has only been in common use for the last three or four years. The term is "railway station".
This book is noticable for the late appearance of Miss Marple, who doesn't apear until the last quarter of the book.
During one of the flashbacks, Edith is playing a song called The Sabre Dance on the xylophone. The flashback was supposed to be in 1934, but the song wasn't composed until the 1940's.
Isla Fisher was rumoured to play Gwenda.