- Retroactive Recognition: Although the performers in the short films often included familiar faces from the British stage and screen (such as Edward Sinclair, Frank Thornton, Burt Kwouk, and Kate O'Mara), some of the cast members' most famous roles were still years ahead of them:
- Private Rhodes from "Goodbye Sarge" is played by John Challis. Seven years later, he was cast as Boycie in Only Fools and Horses (a role he reprised in The Green Green Grass).
- The voice of photography studio investor Ralph Damon from "Portrait in Black" may be more recognisable to modern viewers than his face, as his actor, Gerald Flood, provided the voice of Kamelion in the Peter Davison era of Doctor Who several years later. Meanwhile, his fellow suspect, hairdresser Ray Hunt, is played by a young David Yip, six years before his breakthrough role in The Chinese Detective (and nine years before his single scene as Wu Han in Indiana Jones and the Temple of Doom).
- Two cast members from different episodes found more lasting fame two decades later on The Vicar of Dibley; Sergeant Channing from "Final Drive" is played by Gary Waldhorn, who played David Horton in Dibley, while General Malkol from "A Deadly Tan" is played by John Bluthal, who played Frank Pickle.
- Dave the drummer in "Pop Goes the Weasel" was played by a young Robert Lindsay, who had only just been cast as Jakey Smith in Get Some In! and was still a few years from finding greater fame in such series as Citizen Smith, G.B.H., and My Family.
- Mary Tamm appeared as suspect Valerie Austin in "Nothing to Declare" several years before being cast in her most famous role as the first Romana in the Tom Baker era of Doctor Who.
- Malcolm Jackson, son of the Victim of the Week in "Death at the Top", was played by Christopher Biggins when he was still mostly known as a character actor (his previous roles included Lukewarm in Porridge); his performance as Nero in I, Claudius, just the first of many roles that brought him to a wider audience, was still a year away.
- Commander Blade of MI5 in "Too Many Cooks" was played by Clive Swift over fifteen years before he found more enduring fame as Henpecked Husband Richard Bucket in Keeping Up Appearances, while suspect Clarence Brooks was played by Edward Hardwicke over a decade before he played Watson to Jeremy Brett's Holmes in ITV's Sherlock Holmes adaptations, and fellow suspect Lazlo Bretz was played by Canadian actor Bruce Boa several years before his more familiar roles as Mr. Hamilton in the Fawlty Towers episode "Waldorf Salad" and General Rieekan in The Empire Strikes Back. And sharp-eyed viewers may notice a 17-year-old Peter Capaldi in the front row of the studio audience, just behind the members of the public playing along with the celebrities.
- Arthur Johnson, son of the Victim of the Week in "Worth Dying for", was played by a young Jeff Rawle, whom contemporary audiences are more likely to recognise as George from Drop the Dead Donkey or Amos Diggory from Harry Potter and the Goblet of Fire.
- Two future 'Allo 'Allo! cast members appeared in different episodes of Whodunnit?; Mr. Bailey from "Worth Dying For" is played by Robin Parkinson, later to become the second Ernest LeClerc after the death of Derek Royle, while Jackie Meredith from "Underneath the Archers" is played by Moira Foot, who later played Communist Resistance leader Denise Laroque.
- The suspects in "Fly Me, I'm Dead" included Geoffrey Palmer as Major Culbertson. At the time, he was mostly known for his stage work and occasional guest spots on TV; his recurring roles as Jimmy Anderson in The Fall and Rise of Reginald Perrin, Ben Parkinson in Butterflies, and Lionel Hardcastle in As Time Goes By, as well as his more familiar guest spot as Dr. Price in the Fawlty Towers episode "The Kipper and the Corpse", were all still in his future.
- Roy Sharp from "Beware Wet Paint!" is played by Norman Eshley. A year later, he was cast as Jeffrey Fourmile in George & Mildred, the role for which he is most known today.
- Robert Lee appeared in "Future Imperfect" as Mr. Lim, a year before being cast in his most familiar role as Taro Nagazumi in Mind Your Language.
- DI March in "Time to Dye" and Philby in "A Dead Cert" were both played by Paul Darrow, who was still a few years away from being cast as Avon in Blake's 7.
- Miss Frisby from "No Happy Returns" is played by Josephine Tewson, who had an extensive career working with such comedians as The Two Ronnies and Dick Emery, but who is best remembered for playing Elizabeth Warden in Keeping Up Appearances a decade and a half after Whodunnit?.
- Miss Tillitson from "Last Tango in Tooting" is played by Vivienne Johnson, whom today's audiences likely know best as Young Mr. Grace's Nurse in Are You Being Served?, a role in which she was cast a year after her Whodunnit? appearances.
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