- Mashing buttons at the ends of some songs triggers some special sound effects:
- Older versions would only allow you to play EX charts on extra stages. This was later relaxed so that only new songs have locked EX charts, and even then only require playing the Hyper to unlock the EX.
- The Danza: Venus is based off of Bemani musicians DJ YOSHITAKA and Sota Fujimori, who use the alias "Venus" when collaborating together for songs.
- Invisible Advertising: peace was released with virtually no promotion or location-testing other than an announcement the day before it. This is a little suspicious, given that Sound Voltex Vivid Wave was announced around roughly the same time with the usual pre-release promotional routine.
- Keep Circulating the Tapes: The "POWER FOLK" songs were removed from the series after the composer, Atsushi Shindo, was accused of plagiarism. They can still be found on YouTube, however.
- Missing Episode: The full version of "Airport Shuttle" has been removed from Nico Nico Douga, and can't be found anywhere else.
- No Export for You: Only the first arcade pop'n music, an XBLA adaptation with a small number of songs and a low difficulty ceiling, and an In Name Only Wii version have been released outside Japan. While Round 1 locations in the US do carry pop'n cabinets, they are all running old offline versions rather than current, online-required versions. Even non-Japan non-Korea Asia doesn't have access to current pop'n versions!
- Portmanteau Series Nickname: Usagi to Neko to Shounen no Yume is abbreviated to just UsaNeko by fans.
- Real Song Theme Tune: Cover versions of J-Pop and Anime music that litter the game (and even international hits in Partynote . Also, the Disney version and Animelo versions of the game.
- Screwed by the Lawyers:
- The reason why the full version of "Airport Shuttle" is now a Missing Episode is because Konami owns the rights to the song, and are thus the only ones allowed to release it at all (or not).
- The arcade versions of Pop'n Music 14 and 15 have a Super Mario Bros. music medley available as a playable song. It's not available in the PS2 versions, for an obvious reason.
Trivia / pop'n music