Margaret Rutherford portrayed Miss Marple as a far more active and athletic person than the retiring spinster as acted by Joan Hickson (and Geraldine McEwan).

Several Miss Marple stories have "ah hah!" moments revealed because Miss M. has made a trip to Somerset House (formerly the Registry of Births, Marriages and Deaths) without the reader knowing. Naughty of Mrs. Christie !

In this respect, some TV adaptations are purer "whodunnit" than the original Miss Marple novels, though not the Poirot mysteries.