!!The books

* CreatorBacklash: P.L. Travers called the second chapter of the first book, "The Day Out", the worst ''Mary Poppins'' story she ever wrote. (For people who haven't read the book: Take the "Jolly Holiday" scene of the movie, remove Jane, Michael, the talking animals, and the horse race, and replace the penguin waiters with a human waiter, and you'll have an idea of how "The Day Out" goes.) Incidentally, this was the first Mary Poppins story - an earlier version, "Mary Poppins and the Match-Man," was published as a short story in 1926.
* KeepCirculatingTheTapes:
** The 1934 version of the first book has gone out of print, meaning that fans who want to read the unedited version of "Bad Tuesday" have to hunt down an old copy, keeping in mind that there was a good reason Travers felt like she had to edit it herself.
** The individual editions of ''Mary Poppins in Cherry Tree Lane'' and ''Mary Poppins and the House Next Door'' have also gone out of print. The 2010 omnibus ''Mary Poppins: The Complete Collection''[[note]]Which actually only has six of the eight books, skipping ''Mary Poppins From A to Z'' and ''Mary Poppins in the Kitchen''[[/note]] has those two stories, albeit with either most or all of their pictures removed.
* SpinOffCookbook: ''Mary Poppins in the Kitchen'' is a Cookery Book with a Story by P.L. Travers. As the title suggests, this one has a story, in which Mary teaches the Banks kids to cook.
* WriteWhoYouKnow:
** The character of Mr. Banks is based on the author's own father, Travers Goff.
** Mary Poppins herself was based on Travers' Great Aunt Ellie (Helen Morehead).

!!The Disney movie
* AbilityOverAppearance: Uncle Albert was originally written as having a Viennese accent. Creator/EdWynn, however, didn't attempt the accent--or even an English accent, for that matter. He was just himself, ad-libbing many of the lines he says while laughing on the ceiling in the "I Love to Laugh" scene.
* ActingForTwo:
** Creator/DickVanDyke does Bert and Mr. Dawes, Sr.
** In addition to his credited role as Mr. Banks, Creator/DavidTomlinson voices Mary Poppins's umbrella, some of the animated characters in the chalk drawing scene, as well as Admiral Boom's first mate.
** Besides Mary Poppins, Julie Andrews whistled for the robin and was one of the female pearlies during "Supercalifragilisticexpialidocious." She was only credited for the title character.
* ApprovalOfGod: All other considerations aside, P.L. Travers ''did'' approve of Creator/JulieAndrews' performance as Mary Poppins.
* AwesomeDearBoy: Creator/WaltDisney wanted only one person for the small part of the Bird Woman--Jane Darwell, his favorite actress. Darwell had a long, storied career in character parts (she's probably best remembered for playing Ma Joad in ''Film/TheGrapesOfWrath'', which won her an Oscar), and by that point was retired, so she politely declined when a representative offered her the role. Undeterred, Disney himself personally traveled to Darwell's retirement home to ask her to accept, even offering to have a private limousine sent to pick her up and bring her back on her single day of shooting. Darwell was so touched by the offer and Walt's appreciation for her that she agreed to appear in the film, which turned out to be Darwell's final film role.
* CaliforniaDoubling: The whole thing was filmed on soundstages at Disney's Burbank studios, with matte paintings used for {{Establishing Shot}}s of London. Over fifty years later, the sequel, ''Film/MaryPoppinsReturns'', would actually be shot in the U.K.
* {{Corpsing}}: Creator/JulieAndrews admitted that she had a hard time keeping a straight face when she was filming with Creator/EdWynn.
* CreatorChosenCasting:
** Creator/WaltDisney hand-picked Creator/JulieAndrews after seeing her in ''Theatre/{{Camelot}}'' on Broadway. She was three months pregnant at the time Disney offered her the role, but he was so keen to cast her that he waited until she gave birth to begin filming so that she could play the part. What really sealed the deal was when P.L. Travers spoke to her on the telephone from her hospital bed. In fact, Andrews was one of the few things that Travers liked about the film.
** Disney cast Creator/DickVanDyke after seeing his work on ''Series/TheDickVanDykeShow''.
** As noted under AwesomeDearBoy and StuntCasting, Disney wanted his favorite actress, Jane Darwell, for the part of the Bird Woman, going so far as to personally travel to her retirement home and arrange a private limousine to transport her to and from the set.
* CreatorsFavorite: "Feed the Birds" is widely reported to have been Creator/WaltDisney's favorite song, and he would often request that the Sherman Brothers play it for him. Disney's love for the song was such that Richard Sherman played it to dedicate the "Partners" statue at Ride/{{Disneyland}}, saying "Now I'll play Walt Disney's favorite song... [[SugarWiki/HeartwarmingMoments and it's just for him.]]"
* CrossDressingVoices: The bird woman's voice was dubbed by the male Robert Sherman in post-production.
* CutSong: Among others in the film:
** "The Land of Sand" brought Mary Poppins and the children to a desert. The melody was recycled for "Trust in Me" from ''WesternAnimation/{{The Jungle Book|1967}}''.
** "The Beautiful Briny Sea" had Mary and the children travel underwater. The song was finally used in ''Film/BedknobsAndBroomsticks''.
** "Chimpanzoo" told of a place in which animals could watch humans misbehave inside cages; it's inspired by the "Full Moon" chapter of the original book. The tune became used for a song in ''Anime/LittleNemoAdventuresInSlumberland''.
** A song about Admiral Boom was written for the film. Although the song does not appear in the film, the music can be heard in the score.
** Mary had a song called "Practically Perfect", the melody was used for Sister Suffragette. An unrelated song with the same title was later written for the stage musical.
** "Let's Go Fly a Kite" was going to have a Tin Pan Alley melody until Disney resulted it sounded more British.
** P.L. Travers wanted the film to have non-original songs like Ta-ra-ra Boom-de-ay and Greensleeves, but the Sherman brothers convinced her they wouldn't work (however Greensleeves does appear in the background).
** While not a song, Mary Poppins was going to Yodel to the chimmary smoke to make the stairs and the fireworks scene had a whole underscore of Step in Time but both were deleted and can be heard and seen in a documentary, Mary Poppins: A Musical Journey, which is a trivia goldmine.
* DarkhorseCasting: Creator/JulieAndrews was a big star on Broadway, but this was her first film. Creator/WaltDisney cast her after seeing her in ''Theatre/{{Camelot}}''.
* DevelopmentGag: "Stay Awake" uses a slowed-down version of Mary Poppins' rejected {{Leitmotif}}.
* DevelopmentHell: Walt Disney had first considered making a live-action adaptation of ''Mary Poppins'' as early as 1938, but P.L. Travers didn't think it could do justice for her books, mainly because Disney hadn't done any live-action films at the time.
* DisownedAdaptation: P.L. Travers absolutely ''hated'' the film, due to its changing of several elements of her original stories and the inclusion of the animated sequence. So much so, that at the premiere, she approached Creator/WaltDisney before its first screening, demanding the sequence be removed. Disney refused, and later, when the film had concluded, Travers broke down crying, not because the people hated the film, but because ''[[http://www.newyorker.com/archive/2005/12/19/051219fa_fact1?currentPage=all they were giving it a standing ovation]]''. Perhaps not surprisingly, the Disney-produced biographical film ''Film/SavingMrBanks'' finesses these facts like mad. According to rare interviews and secondary accounts, Travers said that she thought the film was well made and had a lot of positive aspects to it, including Creator/JulieAndrews' portrayal. However, she felt it was so different from her books that she wasn't happy with the final product.
* EnforcedMethodActing:
** Used a couple of times with the young actors playing Jane and Michael.
** The medicine bottle that pours different colors was a real working prop. The children were not informed of its purpose, so Karen Dotrice's shriek of delight is real.
** The children were unaware that Mr. Dawes Sr. was played by Dick Van Dyke. According to Karen Dotrice (Jane), she didn't know till she saw the end credits.
** Likewise, Karen Dotrice says that in the scene in which the children run away from the bank and get grabbed by a mysterious figure, they weren't told beforehand that the soot-covered figure was actually Bert, who was trying to calm them down.
* FakeBrit:
** Creator/DickVanDyke. That accent. Ironically, he also plays [[spoiler:Mr. Dawes, Sr]], doing so brilliant a job that many viewers don't even realize it was him. Dick van Dyke's Cockney accent is a contender for second most notorious film example of all time. If you're wondering who owns the title for most notorious, see [[Creator/SeanConnery here]]. Dick defended himself on ''Radio/WaitWaitDontTellMe'' by explaining that his accent coach was J. Pat O'Malley, who didn't speak Cockney any better than he did. Though J. Pat O'Malley was English, he was from Burnley, OopNorth and nowhere near London. To hear his take on Cockney listen to Jasper in the original ''WesternAnimation/OneHundredAndOneDalmatians'', for whom he provided the voice, as well as the voice of the Colonel.
** Much more successfully in the case of Mrs Brill, who was played by the Maine native Reta Shaw
* FakeIrish: American Dal [=McKennon=] voices an animated [[{{Oireland}} Oirish]] fox.
* HostilityOnTheSet: When Karen Dotrice appeared on ''Radio/StusShow'' she revealed that [[https://vimeo.com/463698373?fbclid=IwAR2GANP--Wi70tOCXvRQeQ2-2iHnRVrDzT4-u-H1dqkyQBs6eSx5p_tG1pI she and Matthew Garber didn't get along.]] In fact, she claims that Garber was a menace on set. Host Stu Shostak also revealed that Creator/DickVanDyke had told him once that he "was a handful". Dotrice though added that Garber's parents were going through a divorce at the time, which may have contributed to his misbehavior.
* HypotheticalCasting: Creator/DickVanDyke later admitted that he was miscast as Bert and felt that Creator/JimDale or Creator/RonMoody would have been a better choice. P.L. Travers suggested actors like Creator/RichardBurton, Creator/AlecGuinness, Creator/RichardHarris, Creator/RexHarrison, Creator/LaurenceHarvey, Creator/RonMoody, Creator/LaurenceOlivier, Creator/PeterOToole, and Creator/PeterSellers for the role, in keeping with the British nature of her books.
* InspirationForTheWork: The song "Let's Go Fly a Kite" was inspired by Music/TheShermanBrothers' father, Al Sherman, who made kites for neighborhood children as a weekend hobby. In the film, the broken kite represents the broken family. When Mr. Banks mends the kite and the four pieces are taped back together, the four members of the family are also reunited. By transforming her "suffragette ribbon" into the kite's tail, Mrs. Banks also commits herself to being there more for her family.
* IronyAsSheIsCast: Creator/DavidTomlinson, who portrayed the stern and emotionally distant patriarch, George Banks, was by all accounts a loving and devoted father in real life. Even at the height of his career, he was known to avoid showbiz circles and regularly turned down social invites (despite getting tons of them) in order to spend as much time as he could with his family at their home in Buckinghamshire.
* KeepCirculatingTheTapes: The 1997 Walt Disney Masterpiece Collection Laserdisc included an isolated score, which didn't make it onto any DVD/Blu-Ray/Digital releases. Not even the soundtracks include all of it, due to Disney's tendency to save discs two onwards for bonus features. Three of the Laserdisc's other extras[[note]]The documentary ''Practically Perfect in Every Way'', a ''Hollywood Goes To a World Premiere'' vintage newsreel, and a trailer for the original wide theatrical release[[/note]] did make it to DVD, on the 2000 Gold Classic Collection disc; the later releases replace them with extras that cover the same ground, but in more detail.
* KidsMealToy: UsefulNotes/McDonalds featured a train car of one of the penguin waiters as part of their Disney Video Favorites Happy Meal. This promotion also had toys based on ''[[WesternAnimation/MickeyMouse The Spirit of Mickey]]'', ''WesternAnimation/LadyAndTheTramp'', ''Film/{{Flubber}}'', ''WesternAnimation/PocahontasIIJourneyToANewWorld'', and ''WesternAnimation/TheBlackCauldron''.
* LoopingLines:
** Jane Darwell's voice was too weak to be heard on the soundtrack, so Robert Sherman dubbed her.
** While Don Barclay portrayed Mr. Binnacle on set, David Tomlinson re-recorded his dialogue in post-production.
* MoneyDearBoy: Reportedly, the prime reason why P. L. Travers reluctantly sold the rights to adapt her books was because [[https://www.smithsonianmag.com/smithsonian-institution/how-did-pl-travers-the-prickly-author-of-mary-poppins-really-fare-against-walt-disney-180949052/ she needed the money]] as royalties from the novels were dwindling.
* ProductionPosse: There are several Disney regulars in this film.
** Uncle Albert is played by Ed Wynn, who appeared in numerous Disney films, most notably being the voice of the Mad Hatter in ''WesternAnimation/AliceInWonderland''.
** In addition, the film's vocal coach, J. Pat O'Malley, also appeared in numerous Disney films; he voiced Tweedledee and Tweedledum, as well as both the Walrus ''and'' the Carpenter in ''Alice in Wonderland'', voiced both Jasper Badun and the sheepdog Colonel in ''WesternAnimation/OneHundredAndOneDalmatians'', and he was also both Hathi the elephant and Buzzy the vulture in ''WesternAnimation/TheJungleBook1967''.
** Creator/HermioneBaddeley, who played Ellen, the Banks' parlormaid, would later voice Madame Adelaide Bonfamille in ''WesternAnimation/TheAristocats''.
** In addition, Creator/ThurlRavenscroft, who voiced the hog in the barnyard scene in the animation sequence, also appeared in ''The Aristocats'' as the Russian cat. Not to mention his vocal contributions to the Disneyland park.
** Director Robert Stevenson spent much of his career directing live-action Disney films.
** In addition, music editor Evelyn Kennedy also worked on various Disney films, live-action and animated alike.
** Jane, played by Karen Dotrice, previously appeared in ''The Three Lives Of Thomasina'' and later appeared with co-star Matthew Garber (Michael) in ''The Gnome Mobile''.
** Most of Creator/DisneysNineOldMen worked on the animation in the chalk drawing scene.
** This was Creator/DavidTomlinson's first Disney film, but he would go on to appear in ''Film/TheLoveBug'' and ''Film/BedknobsAndBroomsticks'', both of which were directed by the aforementioned Stevenson.
** ''Film/BedknobsAndBroomsticks'' also featured Reginald Owen, who played Admiral Boom, and Arthur Malet, who played Mr. Dawes, Jr.
** This was also Irwin Kostal's first assignment for Disney as conductor and music arranger, but he later performed similar duties on ''Film/BedknobsAndBroomsticks'', ''Film/PetesDragon1977'', and ''WesternAnimation/MickeysChristmasCarol'', while his assistant, James [=MacDonald=], was the featured percussionist for ''WesternAnimation/{{Fantasia}}'' as well as Walt Disney's replacement as the voice of WesternAnimation/MickeyMouse and the original voice of WesternAnimation/HumphreyTheBear.
** Music/TheShermanBrothers wrote music for several Disney films, mostly in the '60s and '70s.
** Betty Lou Gerson has a cameo as the witch-like crone whom the children run away from. That's right, they escaped from [[WesternAnimation/OneHundredAndOneDalmatians Cruella de Vil]] herself! However, Gerson had a less threatening Disney role as the narrator of ''{{WesternAnimation/Cinderella}}''.
* SavedFromDevelopmentHell: Creator/WaltDisney first attempted to purchase the film rights from P. L. Travers as early as 1938. However, Travers refused, as she didn't believe that a film version of her books would do justice to her creation. He spent over twenty years trying to convince her to allow him to make the film. He finally succeeded in 1961, although she demanded and obtained script approval rights.
* SleeperHit: Creator/LindsayEllis noted that musicals seemed to be waning in popularity in the early 1960s, and the film's budget was relatively small compared to some of the other glossy studio releases - suggesting Disney didn't expect it to be a mega hit. It ended up grossing over $100 million worldwide, turned Julie Andrews into a household name, won five Academy Awards and got nominated for an additional eight.
* StarMakingRole: For Creator/JulieAndrews. ''Film/TheSoundOfMusic'' came out shortly after this, solidifying it (and giving Andrews a lot of TypeCasting she tried to shake off).
* StillbornFranchise: Subverted in that after the film's success, Creator/WaltDisney approached P.L. Travers for rights to film the other books, but given her thoughts about how the film deviated from her stories, she unsurprisingly refused; her estate did give Disney their blessing to produce the long-overdue sequel ''Film/MaryPoppinsReturns''.
* StuntCasting: The role of the Bird Woman was offered specifically to the retired Jane Darwell - because she was one of Walt Disney's favorite actresses. He tracked her down to her retirement home and she was so stunned by the gesture, she agreed to play the role.
* ThrowItIn:
** Mr. Dawes Sr.'s trouble walking down the stairs was something Dick Van Dyke did between takes.
** Bert's [[OohMeAccentsSlipping Cockney accent]] is this, basically. Van Dyke tried doing a serious Cockney accent but found he could only manage a bad one.
** Mary's "Cheeky!" comment when her reflection starts showing off was ad libbed by Julie Andrews.
** During Mary Poppins' conversation with Andrew, Miss Lark's dog, the dog sneezed, and Andrews, still in character, said, "Bless you."
** In the script, when Bert suggests going to the circus, he was supposed to do a sabre-throwing routine, but instead, Van Dyke performed a tightrope act.
** When Glynis Johns, who played Mrs. Banks, was invited to the studios for the first time, she mistakenly assumed that she was going to be offered the part of Mary, and was taken aback when she was told about her smaller role. Walt Disney, thinking quickly, loudly told her that she didn't have to worry, because the Sherman Brothers (who were standing nearby) had written Mrs. Banks an incredible song that she was sure to love, which they'd play for her right after he took her to lunch. Needless to say, that "incredible song" ''didn't exist yet''--it was Walt's way of signaling the brothers to write something immediately. When Disney and Johns returned from their lunch, "Sister Suffragette" was ready for the film.
* WagTheDirector: One of Creator/JulieAndrews' favorite songs was "Stay Awake". When she heard that there were plans to delete it, she wrote a letter of concern to P.L. Travers, who instantly insisted that the song remain in the film.
* WhatCouldHaveBeen:
** Disney offered to do an AnimatedAdaptation, but Travers felt [[AnimationAgeGhetto no one would take the movie seriously if it was animated]].
*** Speaking of animated adaptations, an animated prequel portraying a young Mary Poppins under the working title ''Miss Mary Poppins'' was in development in 2003, or at least according to [[https://haraldsiepermann.com/2019/06/11/miss-mary-poppins/ one blog]]. Reportedly, while the studio liked the idea, P. L. Travers's estate no-sold them on the idea as they didn't want Disney to develop on the Poppins mythos even further.
** Walt was negotiating to have the rights to film ''Film/BedknobsAndBroomsticks'' in case negotiations for the rights to ''Mary Poppins'' fell through.
** The book had a chapter in which Mary Poppins and the children use a magic compass to visit different countries. Music/TheShermanBrothers wrote a wide assortment of songs to use for their journey, but the chapter ultimately went unadapted.
** Creator/HayleyMills at one point was announced as being attached to star, presumably as Jane. This was in 1961 when she had a multi-film contract with Disney.
** Creator/BetteDavis and Creator/AngelaLansbury were considered for Mary Poppins. Lansbury ended up instead starring in ''Film/BedknobsAndBroomsticks'', and later playing a supporting role in ''Film/MaryPoppinsReturns''.
** P.L. Travers suggested dropping a few hints that Mr. Banks used to have Mary Poppins as his nanny.
** Mrs Banks has no name in the books. The planned name for her was Cynthia but PL Travers wanted a more English sounding name - and they came up with Winifred. The names that Bert lists during the "Jolly Holiday" sequence are among those that were considered for her.
** Creator/FredAstaire, Creator/JimDale, Creator/DannyKaye, Creator/AnthonyNewley, and even Creator/CaryGrant were considered for Bert.
** Original choices for George Banks included Creator/RichardHarris, Creator/JamesMason, Creator/GeorgeSanders, Creator/DonaldSutherland, and Creator/TerryThomas.
** Tony Baxter, former Senior Vice President of Walt Disney Imagineering, joined the company after sharing [[https://www.youtube.com/watch?v=WU6X1eLoVWI this concept]] for a ''Mary Poppins'' ride. Had it actually become built, guests would mount merry-go-round horses that would leap off their turntables, and prance through the same chalk drawings where Mary Poppins, Bert, and the Banks children shared a "Jolly Holiday". After the rain dissolves the drawings, the horses would take their riders across the rooftops of London.
** Music/TheShermanBrothers originally planned to use the song "Chim-Chim-Cheree" for all the music in the rooftop finale. However, when special effects supervisor Peter Ellenshaw brought the English pub song "Knees Up Mother Brown" to their attention, they decided to make their own variation, resulting in "Step In Time".

!!The stage musical
* ActingForTwo: Depending on the production, the actress who plays Miss Andrew also plays either Queen Victoria or the Bird Woman.
* CutSong:
** "Temper Temper" eventually was cut from the stage musical, due to [[WhatDoYouMeanItsNotForKids complaints by parents]] and that the producers of the show's Dutch production didn't like the idea of the kids being put on trial. The slightly tamer nightmare-inspired "Playing The Game" replaced the song when the US tour began and the changes have been reinstated to the Broadway production as well as future productions of the show.
** "What I Can Do" (a precursor to the song "Being Mrs. Banks") and "She's Ever So Mary Poppins" were two songs originally written for the show, but cut for various reasons.
* DevelopmentHell: Cameron Mackintosh first met with P.L. Travers in 1993 to discuss adapting the Mary Poppins books to the stage. While initially turning down the use of the film's songs, she ultimately agreed to an adaptation as long as no one involved with the film was directly involved. After Travers' death in 1996, plans for the show were in limbo until 2001 when Mackintosh met Thomas Schumacher, head of Creator/DisneyTheatricalProductions, and the show began development the following year.
* MeaningfulReleaseDate: The show opened in London in December 2004, forty years after the film was released.
* RoleReprise: Gavin Lee originated the role of Bert in London, on Platform/{{Broadway}} and on the US National Tour.
* WhatCouldHaveBeen: One piece of concept art shows Mary Poppins leaving via a smoke staircase at the end of Act 1. This was scrapped in favor of her flying away.
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