%%* BigLippedAlligatorMoment: the Nightmare Song.
* HilariousInHindsight:
** As of 2010, Great Britain is ruled by a Liberal-Conservative coalition.
** And post-Brexit, Prime Minister Theresa May identifies herself as a Liberal Conservative.
** In "O Foolish Fay", the Fairy Queen acknowledges her attraction to Captain Shaw, London's fire chief at the time and [[LeaningOnTheFourthWall a regular first-night attendee]]. A few years later, Shaw was involved in a messy adultery scandal.
* ProtagonistTitleFallacy: Iolanthe has an important role, but she's definitely not the main character.
* TearJerker: When Iolanthe pleads her case to the Lord Chancellor, and then [[spoiler:when her plea fails, revealing her identity to him, and his completely non-comedic reaction.]]

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