These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Many of the times a funny word comes up on the board, or where a contestant declares a "Dirty" word often count. The word "Fart" once showed up on the board, along with "Poo" and then "Poof".note (While "Poof" doesn't mean anything in most of the world, it's a regional slang for a gay person in a similar way to "Fag", which is why people laughed.) It also deserves special mention when the first letters were "ORGA" and Carol began to dread the next few letters.
Richard was once GOTCHA'ed for an entire episode, only discovering the joke upon seeing the Conundrum answer (HOGCAT = GOTCHA). Only a small portion was ever aired, but the full taping (complete with stopdown footage) can be seen here.
Mis-blamed: Did you see that video / image with the word Cuntflaps on the board? Well, that didn't actually happen; it was a photoshopped hoax.note (You can see it in the video where one letter moves around a bit, and there have to be at least three vowels in the selection.) Even if that did happen, the second the word cunt showed up, someone would have come out and changed it.
Values Dissonance: one might perhaps observe this in the roles of the hostesses over the programme's history from supporting role to essentially fully-fledged co-presenter. None there just to stand around putting up the letters and numbers anymore, and even Carol Vorderman's original role checking the numbers was given the nickname "vital statistician" back in '82 (which might sound a wee bit sexist now!) Arguably subverted by the attention Rachel Riley gets due to her looks, mind you, but that's perhaps the audience's fault...
What Could Have Been: A pilot for a US adaption was made; details are here. It notably disposed of the numbers round, and had celebrities playing with the contestants; it's not surprising that Jon Peters, a producer synonymous with Executive Meddling, was at the helm here.
What The Hell Casting Agency: To say that Nick Hewer was a surprising choice for host would be a spectacular understatement. He hasn't actually taken over at the time of writing, so this could yet turn out to be a stroke of genius.