* AwesomeMusic: The whole movie, but special mention goes to the opening song, which is rife with MickeyMousing.
** "Trouble in River City," especially when sung by Robert Preston, is a classic of the American musical.
* CoveredUp: How many of you knew that Music/TheBeatles' hit "'Til There Was You" originated in this musical?
* DesignatedVillain: Charlie Cowell, the anvil salesman who hates Hill and wants to expose him as a fraud. He's a little sleazy, hitting on Marian, but he ends the play [[UnintentionallySympathetic having probably lost his job and watching Harold Hill get away with everything]].
* EarWorm: A lot of the songs, including "Pick-a-Little, Talk-a-Little", "Shipoopi", "Ya Got Trouble", "Iowa Stubborn", and "Marian the Librarian."
* FunnyAneurysmMoment: The song "Gary, Indiana". When ''The Music Man'' first debuted in 1957, the song was unintentionally funny due to Gary's reputation at the time as a bustling factory city (U.S. Steel) famous for vice dens of gambling and prostitution. In the present day, Gary is just another [[DyingTown dying Rust Belt factory town]] with large numbers of abandoned buildings.
** In a bit of historical irony, [[Music/MichaelJackson the future King of Pop]] was born in that very state the year after the musical debuted.
* HilariousInHindsight: The salemen on the train are ''rapping''! This concept actually came full circle during the 2014 Tony Awards, when [[https://www.youtube.com/watch?v=hx2N2ohbEWQ LL Cool J and T.I. performed the song with Hugh Jackman]].[[note]]This was the first time in the history of the awards' ceremony when rap music was performed on stage (this being a couple years before ''Theatre/{{Hamilton}}''.[[/note]]
* UnacceptableTargets: Meredith Wilson personally wrote in copies of the libretto for ammeter productions ''not'' to treat the Iowan's small-town quaintness with derision because, to them, it's not supposed to be ironic.
* WeirdAlEffect: Quite a few people think that "Shipoopi" originated on ''WesternAnimation/FamilyGuy''.
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