- Big-Lipped Alligator Moment: the Nightmare Song.
- Getting Crap Past the Radar: As with many Gilbert and Sullivan works, certain scenes are easy targets for this.
Strephon: There's no use concealing it any longer—I am half a fairy—the upper half.
Phyllis: Dear me!... There's nothing to show it...
Strephon: Stop that!
- The obvious way to play this exchange is to have Phyllis feel around on his back for wings, but there's no rule saying she has to...
- Hilarious in Hindsight: As of 2010, Great Britain is ruled by a Liberal-Conservative coalition.
- And post-Brexit, our new Prime Minister Theresa May identifies herself as a Liberal Conservative.
- Protagonist Title Fallacy: Iolanthe has an important role, but she's definitely not the main character.
- Tear Jerker: When Iolanthe pleads her case to the Lord Chancellor, and then when her plea fails.
- The Unpronounceable: Is Leila supposed to be "L'eye-la," "Lee-la," or "Lay-la"?