* KeepCirculatingTheTapes: Whilst Challenge TV shows all episodes from the Carlton-era series whilst Roy Walker was hosting, the original run by TVS (from 1986 to 1993) will likely never see the light of day again, as most all of the TVS library is currently in legal limbo, and the paperwork for the TVS archives is supposedly lost[[note]] It began when TVS decided to purchase MTM Enterprises (the creators of ''Series/TheMaryTylerMooreShow'', ''Series/WKRPInCincinnati'', and others), and got heavily into debt, and as a result lost their broadcasting rights to Meridian, and it was then sold to International Family Entertainment, the holding company for what is now [[Creator/ABCFamily Freeform]], spun off from Pat Robertson's CBN organization. When Creator/FoxKids acquired what then became Fox Family, MTM came along, and when that got sold to Disney, MTM's library had already been absorbed into Fox. Throughout all these legal shenanigans, TVS' library got lost in the shuffle.[[/note]] . However, episodes from the TVS era do exist on Website/YouTube to be watched at any time, presuming that no one tries to call copyright.
** Meanwhile, the original American version is presumably held by Creator/WarnerBros (they acquired the distributor, Telepictures, along with Creator/{{Lorimar}} in 1989), but hasn't been seen anywhere since the original run.
* MissingEpisode: To go with the above mention of the TVS episodes never being aired on TV anymore, whilst episodes of the original British series are being uploaded to [=YouTube=], some episodes are totally lost, though this would mainly be due to Challenge's original incarnation, The Family Channel, not airing certain episodes, mainly the original celebrity specials.
* ProductionPosse: Art James and Marty Pasetta had previously worked together on a late 60s game show called ''Temptation'' ([[NamesTheSame not to be confused with the]] [[Series/Temptation2007 crap pile of that name from 2007]]), although it was apparently a coincidence that this happened.
* ScrewedByTheNetwork: The US version suffered from the crowded syndication market that felled many other shows over the years; the then-new Lorimar-Telepictures had an "insurance policy" in place for stations, ''Perfect Match'', hosted by [[Series/{{Blackout}} Bob]] [[Series/WheelOfFortune Goen]]. And the UK version initially got screwed over by TVS' loss of broadcasting rights, only for Carlton (the replacement for Thames on London weekdays) to rescue it and run it until 2002 (though the move to daytime is where the series started slipping).
* TitleSequence: Would you believe that the opening titles for the 1986-1993 series were created by ''Creator/ElectronicArts'', of all people?
* WhatCouldHaveBeen: Wink Martindale posted on Youtube a sizzle reel for a potential US revival series- it didn't get picked up, though. [[Series/{{Whammy}} Todd]] [[Series/FamilyGameNight Newton]] hosted. See it [[https://www.youtube.com/watch?v=HdnVYPCKX3s here]].
** Before that, Pasetta had tried to revive it in 1987 as ''[[https://www.youtube.com/watch?v=T7V4Ei39uCg&t=37s Puzzle Roulette]]'', and again in 1989 as ''The Puzzle Game''. [[Series/BullseyeUS Jim]] [[Series/TheDatingGame Lange]] hosted these attempts; the former may have been intended as a replacement for another Lange series, ''Series/TheOneMillionChanceOfALifetime'' and possibly as Lorimar-Telepictures' "apology" for cancelling the original series so quickly.
** Apparently, Pasetta originally pitched the US version for Creator/{{ABC}}'s lineup; however, they turned it down, most likely because they were phasing game shows out of their daytime lineup by that point.