Richard Briers received £25 for his scene as "Mrs. Binster", shot on the final day of filming.
Joan Hickson, who plays Mrs. Kidder in this film, starred as Jane Marple in its remake Agatha Christie's Miss Marple: 4:50 from Paddington and many other TV-movies.
Craddock's forename is never given on-screen, though his office door gives the initial as 'R'.
Despite privately remaining unimpressed by the film, Agatha Christie dedicated her 1962 book "The Mirror Crack'd From Side to Side" to Margaret Rutherford, "in admiration".
During the opening journey on the 4.50, Miss Marple reads "Death Has Windows" by Michael Southcott: this was a fictitious novel mocked up by the production team. Towards the close of the film she has a Fontana paperback copy of "Murder is Easy" by her creator, Agatha Christie.
Miss Marple gives her address as Old Pasture Lane, Milchester. In reality the house was owned by John Mills in Denham, Buckinghamshire.
Miss Marple won the Ladies' Open Golf Handicap in 1921.
The character of Miss Marple's friend, Mr. Stringer, was not part of the original story. The part was written for Stringer Davis who was married to Margaret Rutherford.
The name of "Emma Ackenthorpe" was changed to "Evelin Ackenthorpe" in the German dubbed version.
The part of Alexander was dubbed by child actor Martin Stephens, who had appeared in such films as Village of the Damned and The Innocents.
This was the first of the "Miss Marple" series starring Margaret Rutherford.