* MarthDebutedInSmashBros: Due to their third album not releasing in the US before 2019, the only copies of the songs from that album were from their ''Anthology'' live album.
* MissingEpisode:
** Their ''Anthology'' live album (the deluxe version, anyways) is missing 'Just My Luck' from the film of the same name, even though they played every other song they made up until that point.
** Most of their earliest music videos from their first 3 albums aren't officially available on places like their [[https://www.youtube.com/c/mcfly/videos YouTube channel]] and the ones that ''are'' there aren't in the best quality, despite being shot in higher quality, due to being uploaded back when low bitrates were the norm on the site. They're not even region-locked to the UK like their friends from Busted's. However, a small selection of them are available unofficially in low-quality fan uploads.
* NoExportForYou: [=McFly=] released their fourth studio album for free in copies of The Mail on Sunday, a UK-based newspaper. So of course, fans outside of the UK were unable to own the album at all, let alone for free. A new version of the album (with additional songs) was later released to buy in-store, making it easier for their fanbase outside of the UK to own a copy.
** At first, "The Greatest Bits" was a compilation album of B-Sides only released in Woolworths stores in the UK. As if this didn't make it hard enough for non-UK fans to get a hold of a copy, the Woolworths franchise collapsed due to the 2008 recession and all the stores closed down as a result, making this album the rarest and most sought-after of [=McFly=]'s releases. As of December 2019, a high-quality release has been put on the US iTunes store and streaming services by Island.
** After a while of not being on the American iTunes Store and streaming services, their third album finally averted this by being available overseas digitally as of May 2019.
* SequelGap: Though they released the single 'Love is on the Radio' in 2013, for a planned 6th studio album, and they released the [=McBusted=] album with Matt and James of Busted in 2014, and their live ''Anthology'' album, their next proper studio album wouldn't be release for ''9 years'' after ''Above the Noise.''
* WhatCouldHaveBeen: [=McFly=]'s fifth studio album could have been a lot different. According to one interview, a whole album's worth of songs had been written, only for them all apart from 'End of The World' and 'I Need a Woman' to be scrapped, instead starting from scratch to create their NewSoundAlbum, Above The Noise.
** Not only that, there were apparently plans to release a science fiction themed album. These plans were particularly evident from 'End of the World', a song about the world ending that samples Music/JeffWaynesMusicalVersionOfTheWarOfTheWorlds.
** 'I Wanna Hold You' was originally recorded with 99% ''very'' different [[https://www.youtube.com/watch?v=mdjw1-49Jyk lyrics]].
** 'Star Girl' was ''also'' [[https://www.youtube.com/watch?v=bnmLvj4xtAs very different in an early demo version]], a version some fans like to refer to as "Good Night" about shooting a movie (probably referring to their love lives feeling like a Rom Com). Listening to this version makes the line, "I don't wanna give you away because it makes no sense at all" in the finished song make more sense, since it's a holdover line from this early version.
** If [=McBusted=] didn't happen, the guys would've finished their 6th studio album by late 2013 or in 2014 and released ''it'' instead.
** A rumor in 2009 had it that they were in the running for writing a song for the ''Film/DragonBallEvolution'' soundtrack. They ''do'' have a demo of a song called '[[https://www.youtube.com/watch?v=BSNNJ5IPeoM Dragonballs]]' that has the line that they'll find the titular Dragon Balls.
** ''The Lost Songs'' might've originally been called ''Hyperion'' if it was released in 2013/14 when it was supposed to come out, given there's a song called that and one of the songs, 'Break Me', also uses the word.
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