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* AccidentallyCorrectWriting:
** Although Gilbert didn't know it at the time, Ko-Ko is an actual Japanese name (a girl's name, amusingly enough).
** When Ko-Ko protests that he doesn't see how a man can cut off his own head, Pish-Tush replies that if he could succeed in cutting it half off, that would at least be something. During seppuku, ritual suicide, a samurai would have a second ready to deliver the killing blow while he disembowelled himself, striking his neck with a sword but crucially ''not'' fully cutting his head off.
* RevivalByCommercialization: A lot of people who were young in the late 2000s first learned "As Some Day It May Happen" from ''WesternAnimation/FamilyGuy''.
* StuntCasting: The role of Ko-Ko has been performed by comic luminaries such as Creator/GrouchoMarx and Creator/EricIdle.
* ThrowItIn: When Yum-Yum reassures Nanki-Poo that she does not love Ko-Ko, his reply as originally written was simply "Rapture!" In a rehearsal Durward Lely, the actor playing Nanki-Poo, delivered the word "Rapture!" too strongly for Gilbert's liking, prompting Gilbert to tell him, "Modified rapture" (meaning "tone it down a bit"). Lely responded, "Modified rapture!" and Gilbert liked it and added "modified" to the script.
** Rutland Barrington, the original Pooh-Bah, liked to throw ad-libs into performances. Gilbert usually crossly told him not to do it again, but occasionally he liked one of Barrington's additions and added it to the official script. An example is when the Mikado tells Ko-Ko, Pitti-Sing and Pooh-Bah that their executions will take place after luncheon, and Pooh-Bah replies, "I don't want any lunch."
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