I believe that some commentators here are a tad off base with their assumptions.
The MGM production team for The Alphabet Murders was the same as for Margaret Rutherford's Miss Marple Series, which is why she and Stringer David had cameos. Therefore, it is highly doubtful that this was director Frank Tashlin's idea as some said.
Numerous posters here said that the slapstick comedy in this film was directly inspired by Peter Sellers' Inspector Clouseau. Doubtful. Sellers' Pink Panther slapstick is far broader and much more plentiful. If anything ABC's slapstick is derived from Tashlin's Bugs Bunny & Jerry Lewis days but equally from Randall himself. For my money the slapstick here is uninspired and falls flat - it's completely unnecessary.
Producer Lawrence Bachman, the screen writing team of David Pursall & Jack Seddon, cinematographer Desmond Dickinson, art director William Andrews, assistant director David Tomblin and composer Ron Goodwin (unmistakable stylist) all carried on from MGM's Marple films. More than anything this is your connection and inspiration.
Aside from some totally unnecessary slapstick, The Alphabet Murders is a light fun mystery. If you like the Marple series, you'll probably like this.
