Awesome Music: While the songs preformed in the movie are faithful to the original movie, it's The Sherman Brothers performing "Fidelity Fiduciary Bank" for Mrs. Travers that takes the cake. What makes this awesome is that, at the same time, there was a flashback of her father making a speech about the bank. As a result, the two scenes bleed into each other, with the Shermans and Goff finishing each other's sentences and the latter even getting involved in the singing.
Critic-Proof: Many critics, most notably author Harlan Ellison, savaged the picture for its Historical Hero Upgrade of Walt Disney, as well as its treatment of P.L. Travers as an aloof and superior old biddy (Ellison, who had met Travers while she was still alive, was furious that "they took a warm, conscientious, empathic woman and turned her into an Ice Queen"). Many other critics savaged it for its Historical Hero Upgrade of Travers, particularly in how it ignored the entire existence of her stepson whom she had a troubled relationship with, or her lesbian lover. Despite all this, the movie was well received by audiences.
Fridge Brilliance: Walt being able to join Richard Sherman in singing "A Man Has Dreams" despite it being the first time he heard it makes sense: considering the many musical films that came before Mary Poppins, Walt obviously picked up on reading sheet music.
Heartwarming in Hindsight: With Disney's epiphany that Mary Poppins was trying to save Mr. Banks rather than the children, it makes her interactions with Michael and Jane in Mary Poppins Returns all the more sweeter, as they're laced with the implications that she's helping them more than she's helping Michael's children.
Mary Poppins: I've come to look after the Banks children.
Nightmare Fuel: Travers' mother's attempted suicide by calmly walking into a river and trying to drown herself.
One-Scene Wonder: Julie Andrews doesn't appear until the Mary Poppins premiere, since Saving Mr. Banks completely skips over the filming of Poppins. Fortunately, her impersonator, an uncredited Victoria Summer, effectively re-creates her mid-'60s appearance, thanks to closely studying footage of the real Andrews attending the Mary Poppins premiere.
Spoiled by the Format: The Reveal that "Travers" is not in fact the author's actual surname, but instead the first name of her father, is spoiled by the closed captioning referring to her father by name in every line of dialogue he utters.