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!General trivia:
* International versions were initially required to adhere to Celador's strict licensing requirements, which mandated the use of the Strachans' music and the original graphics package. Foreign versions were also required to build an exact replica of the British set. According to set designer Andy Walmsley, this made the ''Millionaire'' set the most copied scenic design in television history, with a total of 108 replicas built using the original blueprints. Even things such as lighting effects and the host's wardrobe (by Armani) were globally standardized.
* Although the original UK version had an enormous jackpot of one million untaxed sterling pound in 1998, the actual highest jackpot prize of all versions in the world, before the ''Super Millionaire'' event series, was actually in ''Ireland'', where the one million ''punt'' jackpot was worth around 1.18 million in sterling. This was staggeringly higher than any other game show in Ireland has had, though the highest won amount was £250,000. The currency switchover to euro did reduce the jackpot considerably, but even then was and is still relatively staggering for an Irish game show to this day.
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!Specific trivia:
* AdoredByTheNetwork:
** Creator/{{ABC}}'s original version. In fact, this may have actually hurt its longevity since it’s thought that overexposure from being on several nights a week hurt the ratings. At its peak the show was on five nights a week.
** The Creator/NineNetwork's Australian version is a more reasonable instance; it held the same Monday night timeslot for seven years, and it's been on weekdays at 5:30pm since 2009.
** When GSN acquired the Harrison era of the US Version in December 2017, it was quickly given multiple marathons, and was eventually put on the schedule seven days a week, airing as often as '''20 times per week'''. In July 2018, it was reduced to weekends only, then dropped altogether that October.
** Challenge (the UK version of GSN) has always adored reruns of the series since they acquired the broadcast rights to it back in the mid-2000's, under the title of ''Classic Who Wants to be A Millionaire?''. It was originally the most adored show on the channel, until ''Series/{{The Chase|GameShow}}'' stole the spotlight in 2017. By then, this trope was mostly averted. After Great! TV lost the rights, Challenge have started increasing their reruns from one per weekday to four per weekday.
** Back when it launched as the Sony Channel, Great! TV in the UK adored Millionaire a lot by airing 4 episodes every day, that is until after Sony sold the channel to Narrative and eventually lost the rights two years later.
* BannedEpisode: The infamous episode of the UK version where Charles Ingram won the top prize by cheating was never broadcast (producers already suspected something was amiss and stopped the £1 million cheque the day after the episode was recorded), although clips were used in documentaries on the scandal. Later, the series's official [=YouTube=] channel [[https://www.youtube.com/watch?v=BBWR0I9LbOQ uploaded the whole ordeal.]]
* BonusMaterial:
** After the original celebrity version of the US ''Millionaire'', ABC released PopUpTrivia [[https://www.youtube.com/watch?v=X6tSPXJj0Mk versions]] [[https://www.youtube.com/watch?v=OzT8JiXiY2w of some]] [[https://www.youtube.com/watch?v=nTByWWnMwNg of the]] [[https://www.youtube.com/watch?v=TZJMIBN8flY episodes]], which featured small tidbits about them.
** The show's [[https://www.youtube.com/user/millionaireTV official YouTube account]] has unique clips, such as bloopers and behind the scenes.
* ChannelHop: Moved to syndication in 2002 after declining ratings on ABC.
* ColbertBump:The show has been rebooted after cancellation in the US and UK but has constantly being on the air in multiple countries, and ''{{Series/Quiz}}'' and the show's 25th anniversary have revived interest in the once [[WolverinePublicity exhausted]] show.
* CompletelyDifferentTitle: For its first and most popular run in Spain, the show was known as "''Do you'' want to be a millionaire? 50 x 15" (for 50 million for 15 right answers). It returned twice later as "Who wants to be a millionaire?"
* {{Corpsing}}: For some reason, Regis had the giggles when Dan Jolly was a contestant.
** He also had the giggles after Sean Hildreth left with only $1,000 - to clarify, he wasn't laughing at Sean, but the audience member Jeremy whom he brought along, who cracked him up.
* EditedForSyndication:
** GSN inserted jarring commercial cuts when a contestant departs on Regis-hosted episodes. This is most noticeable by the ending cue still in progress by the time the break ends. Later reruns of the show also end immediately after Regis reads the list of contestants who will appear next time, cutting out his goodbyes and replacing whatever credits were there with a set cribbed from a random 2000 episode.
** On episodes from the syndicated era, the play-along "Question of the Day" feature was edited out, resulting in a very abrupt return from the commercial break that originally featured it.
** in 2003 for ITV covering Series 1-4 and 2004 - 2010 for Challenge covering Series 5-27, UK episodes of Millionaire between 1998 and 2010 were reedited under the title "Classic Who Wants To Be A Millionaire" or "Celebrity Who Wants To Be A Millionaire" for syndication.
** With "Classic/Celebrity Millionaire" until 2010 at least half of the episodes were a mixture of 2 or more different editions.
** Classic/Celebrity also used stock audience shots recorded from various shows to cover original commercial break points.
* IAmNotSpock: Especially during the early 2000s, Regis was so identified with this show that nearly everyone that saw him outside the context of the show couldn't help but ask him "Is that your final answer?" Regis mentioned this numerous times in his autobiography, ''Who Wants to Be Me?'' (in one instance, he didn't want to go get his wife popcorn from the theater snack stand because he didn't want to have to deal with the person behind the counter asking: "Is that your final popcorn?!"). The book even featured a comic on the back cover where an unamused Regis is asked this by everyone, culminating in him snapping by shooting a guy and ending up on death row. What does the last rites priest ask? "Is that your final meal?"
* LiveOnStage: "[[https://en.wikipedia.org/wiki/Who_Wants_to_Be_a_Millionaire_–_Play_It! Who Wants to Be a Millionaire – Play It!]]", a recreated version of the show at [[Ride/{{Disneyland}} Disney California Adventure]] and [[Ride/WaltDisneyWorld Disney's Hollywood Studios]]. The game was played for points rather than money. Small prizes, such as shirts and baseball caps, were awarded for clearing each milestone; million point winners got a free Disney Cruise Line vacation. The contestants also had a time limit to answer each question, using the same time limits the show used during the clock format. The real show occasionally taped special weeks of episodes at the Disney's Hollywood Studios attraction.
* LongRunner: The US version lasted 20 years on ABC and syndication combined. The UK version lasted fifteen years and thirty series. Other international versions are also this.
* MissingEpisode:
** The first US celebrity edition's episodes ([[spoiler:where Drew Carey and Rosie O'Donnell won $500,000 each for their charities]]), and the episode where Ed Toutant returned after a flawed $16,000 question [[spoiler:and went on to win a $1,860,000 progressive jackpot]], have never been rerun on GSN even though ''Millionaire'' reruns were quite common on that network. The fact the latter was a 30 minute episode that wasn't originally intended to be broadcast at all likely hindered its rerun chances.
** Tim Shields' return appearance was never televised at all. In his initial appearance he lost on his $16,000 question, but later showed up in the Tournament of Champions special. When Tim made it into the hot seat in the TOC, Regis touched on this saying the production staff didn't have the right answer to his losing $16,000 question either, so they brought him back, and he went on to win $500,000. Highlights were shown of his $125,000, $250,000, and $500,000 questions, but the full game was never aired.[[note]]Although the $1,000,000 question he walked away from wasn't shown, someone who was in the audience during the taping came forward saying the question was about the last word of the Old Testament, which was "curse".[[/note]]
** The infamous Charles Ingram episode of the UK version was pulled both for the investigation, and the fact that it was recorded on September 10th 2001. It would be aired exactly once, in 2003 immediately after a special explaining how the scam apparently went down.
** A special episode of the US syndicated version featuring a celebrity athlete was pulled from airing due to said athlete making headlines for an anti-doping violation after the episode's taping. A repeat of the season premiere was aired instead. However, the pulled episode eventually aired two years later on GSN.
** For the UK version, a few episodes have not been seen in reruns whether in their Original form or in Classic/Celebrity:
*** 1998 Christmas Special (1st show to be an hour)
*** 1999 Christmas Special's (1st show Broadcast Christmas Eve and the other 3 Broadcast across Christmas Day)
*** The first two Celebrity Specials (1st May 2000 for ITV's Day Of Promise and 4th September 2001 Coronation Street special
*** The live 300th Show
*** 2012 I'm A Celebrity Special
* RecursiveAdaptation: The story of the cheating jackpot winner Charles Ingram had a book written on it, ''Bad Show: The Quiz, The Cough, The Millionaire Major''. This was adapted for a stage play titled ''Quiz: The Musical'', which was in turn adapted for a television drama in 2020, for which many scenes from Ingram's episode (amongst others) were adapted shot-for-shot.
* ScienceMarchesOn: A rare example where a game show acknowledged this and had to make up for it. On the episode that aired May 5, 2006, contestant [[https://millionaire.fandom.com/wiki/Dante_Constable Dante Constable]] answered the $250,000 question "What element, like water, has an unusual physical property that causes it to expand when it freezes?" with "A: Silicon". He was wrong at the time, as the correct answer was "C: Bismuth", and he left with $25,000. However, he returned to the show on the episode that aired September 19, 2006, when Meredith explained that while C was still correct, it was recently discovered at the time that silicon does the same thing, meaning that there were ''two'' correct answers on the question. As a result, the show brought him back, restored his previous progress (including all lifelines used), and placed him as having won $250,000, which he decided to walk away with after being asked his $500,000 question.
* ScrewedByTheLawyers: The change to the Super Mix format seemed to be ringing of this, especially considering it followed the [[http://buzzerblog.flashgameshows.com/the-final-answer-for-millionaire/ victory by Celador International]] (which created the show) over Disney to the tune of $270 Million regarding royalty fees.
* ScrewedByTheNetwork:
** ABC's [[WolverinePublicity over-milkage of the show]] eventually led to a drop in the show's popularity and subsequent cancellation. It lived on in syndication for 17 years, but it never was quite the same.
** Any time GSN acquires reruns of the syndicated version, it doesn't last very long.
* ShortLivedBigImpact: The Creator/{{ABC}} version only lasted three seasons, yet its impact on the then-flagging game show industry was massive, as explained by WhoWantsToBeWhoWantsToBeAMillionaire.
* TechnologyMarchesOn:
** Bank cheques were famously used during Chris Tarrant's era. However by the time Jeremy Clarkson took over they had become old-fashioned (prompting Clarkson to ask his very first contestant if he remembers them). In its place, Clarkson now has a mouse to activate an electronic bank transfer.
** The Phone a Friend lifeline got hit hard with this the further the show got into the TurnOfTheMillennium. By the time it was retired in 2010, 30 seconds proved to be more than enough for someone to look up answers online.
* WhatCouldHaveBeen: Before the ABC version began production, Peter Jennings (longtime anchor for ABC's ''World News Tonight''), Creator/BobCostas, Phil Donahue and Montel Williams were all considered before Regis was chosen.
** The project initially began as a revival attempt for ''Series/The64000Question'', before producer Michael Davies saw the British version of ''Millionaire'' and instead chose to remake it for the US. (Creator/{{CBS}} and Creator/DickClark Productions produced a pilot for a ''$64,000 Question'' revival hosted by Greg Gumbel in 2000 to ride the wave this show created, but it wasn't picked up.)
** ABC asked Regis to continue hosting the show when it moved to syndication. He refused, citing the long taping times due to computers going out.
** Regis briefly considered returning to the show after Meredith left.
** Rosie O’Donnell was asked to host the syndicated version, but declined almost immediately.
** The UK version originally featured a 20-question structure, which starting at £5 would have taken the player up to £5,242,880, and other structures -- including one where the top prize was ''over £50,000,000'' -- were considered.
** UK host Chris Tarrant expressed interest in hosting the Australian version.
** Kermit the Frog was briefly pitched as a contestant on one of the ''Celebrity Millionaire'' episodes, but was rejected because the producers thought it would be "problematic". The way the set was designed, there was no real elegant way to have Kermit there without showing his Muppeteer. He did still appear as an audience member, though.
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