* AdaptationDisplacement: Most people seem to believe the NES version that's now also on Virtual Console was the original. The arcade version was first, but its source code has been lost.
* AssPull: Ending of ''VideoGame/BubbleBobble'''s Game Boy (original monochrome) version.
* BreatherLevel: [[http://www.adamdawes.com/retrogaming/bbguide/guide.html?roundid=74 Level 74]], with its enemies in an enclosed space.
* EarWorm: [[http://www.youtube.com/watch?v=VTmJJ0lUyQc The theme song]] ([[https://www.youtube.com/watch?v=KOuVKxzW4Do NES version here]]), which also [[ThemeTuneCameo appears in other games in the series]] and in the ''Puzzle Bobble[=/=]Bust-A-Move'' series. Of course, there's also [[http://www.youtube.com/watch?v=VYd-PSRXo1o PB/BAM's own theme tune]].
** Or perhaps CrowningMusicOfAwesome! Some of the tracks in the Arrange Mode of ''Plus'' [[http://www.youtube.com/watch?v=F6Ku1i-LLZ4 can be quite catchy in a very pleasant way]]...The original theme included!
** ''Rainbow Islands'': The theme song, which sounds like "[[Film/TheWizardOfOz Over the Rainbow]]", [[http://www.youtube.com/watch?v=r9ihOmqN2bw digs into your brain and won't let go]].
** The bad ending of the arcade original, achieved by finishing with only one player active rather than two, has some [[SurpriseCreepy surprisingly creepy]] [[https://www.youtube.com/watch?v=EtoejHM-H0E music]].
** If you dawdle around too long, you'll get a nasty surprise in the from of [[http://www.cracked.com/article_16247_the-10-most-terrifying-video-game-enemies-all-time_p2.html Baron von Blubba]], a pale, red-eyed, invincible version of the standard Monsta enemy who will relentlessly chase Bub and Bob until either he kills them or the player finishes the stage. And there can be up to two of them.
* PortingDisaster: Most of the non-arcade versions were not well received. The port-bashing section of the first game's Wikipedia article vastly outsized anything else for a while.
** Incineration deaths in the arcade are only otherwise seen in ports on any of the Game Boys and the DS, and although the original GB version kept the style of the arcade sprites during incineration, over half its frames are cut out resulting in a quicker and choppy animation. The GBC version "Classic Bubble Bobble", which generally took the character sprites from ''Part 2/Junior'', uses a wholly different and jarring incineration animation.
** The squish-yourself-against-bubbles animations are implemented (fully but poorly) only in the Game Boy Advance and DS ports of the original.
** In the GBA/DS ports, deaths did not match the arcade implementations. In the port, you freeze in midair when you start spinning out instead of just before you poof away into magic dust. Also, the standing-non-dead sprite frame is used, followed by the sitting-down-dead sprite frame ''only'' when your character spins out.
** The PC port by [=NovaLogic=] is notable for having a serious bug where if the PC is faster than 486DX-33MHz, the game starts to slow down, and the faster the CPU is, the ''slower'' the game runs. The bug starts rearing its ugly head if you have a 486DX2-66 or faster. This actually required a fan-made patch to fix.
* ReplacementScrappy: Games on next-gen systems do not feature the second BetaCouple, Coro or Kulu, implying CanonDiscontinuity and leading to AndNowForSomeoneCompletelyDifferent.
** For the Wii and Xbox 360, they've been replaced with two other females named Pab and Peb, supposedly Bub and Bob's girlfriends.
** For the DS, we have Robolun and Lovelun (a just-as-defenseless robot, and a pink unknown-gender bubble dragon, respectively), and a cousin (red male bubble dragon) named Bubu.
* ShockingSwerve: The true ending of the arcade version, which was ported to the NES and thus the Virtual Console. Then the GBA and DS. And other faithful arcade ports.
* SurpriseDifficulty: Let's see, you got two tiny cute little bubble dragons, and a lot of cute enemies. [[RuleOfCute And they're all smiling or very cute looking]]. '''And the dragons die when they touch anything.'''
* ThatOneLevel: [[https://www.youtube.com/watch?v=nwqPESLvRTk Level 57]] of the NES version of the first game (starts at 1:19). ''And how.''
** [[https://www.adamdawes.com/retrogaming/bbguide/guide.html?roundid=99 Level 99]] is also guaranteed to cause some headaches!
** The Level 99 in the NES/VC version is even worse. Players are suddenly required to [[spoiler:get a crystal ball]] so they can [[spoiler:go through a secret path and]] get a good ending. [[PermanentlyMissableContent And items will disappear after a while.]]
** And [[http://www.adamdawes.com/retrogaming/bbguide/guide.html?roundid=35 Level 35]] is pretty much the end of the game to anybody who can't figure out the bubble jump mechanic, or are not aware of the arcade's AttractMode in which it shows how to do the bubble jump, making this a GimmickLevel. It doesn't help that this jump is made even harder in the C64 version.
** ''Bubble Bobble''[='=]s NES manual and ''Puzzle Bobble/Bust-A-Move''[='=]s SNES port rely on such names as Bubble Buster for the iconic wind-up toy Zen-chan, Stoner for Mighta, Super Socket for the [[VideoGame/SpaceInvaders Invader]], Willy Whistle for Drunk, etc. Puzzle Bobble gave the secret room InvincibleMinorMinion Rascal the name Rubblen. But then ''Bubble Bobble Part 2''[='=]s NES manual gives them wholly different names.
** Self-contradictory in the NES/Virtual Console version of the first game in that if one beats the game with the best ending, a screen with both protagonists and all enemies show up credited with their original names.
** Although Bub and Bob's short 3-letter names have been products of Woolseyism, they work better.