- Kenneth was known as a practical joker on-set. According to Leslie Phillips, during the filming of Carry On Constable, Kenneth (who was dressed as a policeman)went out and stopped a line of traffic, then another one - and just left them there.
- Kenneth published several books before his death: Acid Drops (a wonderfully witty and sometimes downright malicious collection of assorted putdowns), Back Drops: Pages From A Private Diary (certain edited diary highlights) and his autobiography, entitled Just Williams.
- He was the narrator of, and did all the character voices for, the 1980s children's cartoon series Willo The Wisp. Indeed, the blue ghost-like narrator was caricatured to look like Williams, with an elongated nose and flared nostrils.
- Of his fellow Carry On... stars, Kenneth had a liking for Kenneth Connor, Bernard Bresslaw, Joan Sims, Hattie Jacques and Barbara Windsor. His relationship with others- such as Sid James and Charles Hawtrey- were often strained.
- He was a regular panellist on the popular Radio 4 show Just A Minute- hosted by Nicholas Parsons where contestants must speak on a given subject for one minute without hesitation, repetition or deviation- from 1968 until his death.
- The manner of Williams' death is open to interpretation. Whilst the coroner recorded an open verdict, as it was not clear if the fatal overdose had been administered accidentally or deliberately, many see it as suicide. Indeed, there are numerous references to suicide within his diaries, even dating back as early as 1947.
- An Audience With Kenneth Williams was broadcast on Channel 4 on December 23 1983 as part of the long-running An Audience With... variety show series (usually broadcast on ITV). Kenneth spoke about his life, answered questions from the celebrity studio audience, and even sang. This show is also available on DVD.
- He was good friends with Maggie Smith, Gordon Jackson and his wife Rona Anderson, Sheila Hancock and Stanley Baxter.
- On stage, Kenneth appeared opposite Siobhan McKenna as the Dauphin in George Bernard Shaw's St. Joan in 1955 and with Ingrid Bergman in a 1971 production of Captain Brassbound's Conversion.
- Kenneth's first stage role was as the Princess Angelica in The Ring And The Rose at the Manchester Street Junior School, in or around 1935.
- Kenneth kept a diary for more than forty years. In 1993, five years after his death, the diaries were published (edited by Russell Davies).
- Kenneth was asked to take part in the Carry On Laughing television series in 1975, but his agent Peter Eade kept him out of it. This was a good move, as Kenneth noted in his diary after watching an episode: 'It is diabolical. The writing is mean-minded, cheap, derivative and degrading'.
- Along with Billy Connolly, Kenneth holds the record for most appearances on Michael Parkinson's chat show: he had appeared eight times.
- Kenneth Williams is the subject of David Benson's critically-acclaimed show Think No Evil Of Us: My Life With Kenneth Williams which was first performed in 1996 at the Edinburgh Fringe Festival and subsequently toured (also running in the West End of London).
- Kenneth lived alone for the whole of his life. However he did propose marriage to fellow Carry On... star Joan Sims, but she declined.
- He was good friends with playwright Joe Orton, who wrote the role of Inspector Truscott in Loot (1966) for Williams.
- In April 2007, Williams' line 'Infamy, Infamy, they've all got it in for me' (from Carry On Cleo) was voted the greatest one-liner in movie history by a poll of a thousand comedy writers, actors, impressarios and members of the public for the launch of Sky Movies Comedy Channel.
- In the radio show Round The Horne, Williams voiced several characters including J. Peasemold Gruntfuttock (the world's dirtiest old man), folk singer Rambling Syd Rumpo, the Oriental criminal mastermind Dr Chou En Ginsberg MA (failed) and Sandy, part of the camp double-act Julian and Sandy (along with Hugh Paddick).
- He has been portrayed by Adam Godley in the comedy-drama Cor, Blimey- based on Terry Johnson's play Cleo, Camping, Emmanuelle and Dick- and by Michael Sheen in the drama Kenneth Williams: Fantabulosa!
- He appears as a character in Terry Johnson's 1998 play Cleo, Camping, Emmanuelle and Dick (which tells the story of the real-life relationship between Sid James and Barbara Windsor during the making of the Carry On... films).
- He is second only to Bernard Cribbins as most frequent narrator of children's TV series Jackanory, performing in 69 episodes.
- He was the most prolific member of the Carry On... team, appearing in twenty-six films.
- Kenneth Williams: (quoted from his diary) It is impossible to set down the names that have given me lasting pleasure. I suppose I find myself humming Brahms (Vier Ernste Gesange) mostly, or Schumann, or Quilter, but lines I owe to a hundred sources; the delicate tenderness of De La Mare, the sheer daring in Brooke, the grandeur and serenity of Tennyson, but then, I love Henley too.
- Kenneth Williams: (from the final entry in his diary, April 14 1988 Saw the News, watched the dreary saga of murder and mayhem. By 6.30, pain in the back was pulsating as its never done before... so this, plus the stomach trouble combines to torture me- oh- what's the bloody point?
