When Charlie discovers the final Golden Ticket at the sweetshop, the shopkeeper's at first just awed and overjoyed to bear witness to the find, but he proceeds to tell off the many bystanders offering to buy it off of Charlie. He then tells the boy that he's glad to see someone who clearly needs some good luck in his life actually get it.
Wonka's father: All these years, and you haven't flossed.
Wonka: Not once.
To clarify: Wonka's father Wilbur was a dentist who regarded candy of all kinds as a waste of time. He only let his son trick-or-treat to know what to expect, before burning the candy he collected. Once a chocolate survived unscathed and Willy tried it, leading him to become a chocolatier. This caused the falling out with his father. On the walls of his surgery however, was every single newspaper clipping about his son since the day he left. His love for his son overrode any sense of anger he had at his act of rebellion and natural dislike of all things sugary. Aaaawww.
There's also the touching awkwardness of their embrace, which allows the viewer to notice the subtle similarities of their outfits — both are wearing gloves at the time, and their vests are the same style. Much as Willy Wonka tried to put his past behind him, it was unconciously informing bits and pieces of his behavior all along.
And also the small but touching fact that Willy Wonka was always keeping his teeth in mint condition by brushing them everyday because he knew that's what his father would want.
Grandpa George, who up until this point has been pessimistically talking down Charlie's chances of finding a Golden Ticket, talks him out of selling it. "There's plenty of money out there. They print more every day. But this ticket, there's only five of them in the whole world, and that's all there's ever going to be. Only a dummy would give this up for something as common as money."
In a sweet lift from the novel, before the boat ride Willy scoops up a ladle full of the chocolate river, and shares it with Charlie.
The Eleven O'Clock Number in this version, as Willy Wonka takes Charlie up in the Great Glass Elevator and reveals that the boy's won the factory, is a lift from the 1971 adaptation: the iconic "Pure Imagination". The placement of the song this late in the show is significant, as it's the culmination of this show's overarching Aesop about the transformative power of imagination (Charlie's Cheerful Child nature despite his meager circumstances owes a lot to it, for instance), and Douglas Hodge's performance on the cast album is incredibly warm and wonderful — in every sense of the word.
The Reveal at the end: The tramp who encouraged Charlie to buy that one last Wonka Bar was Willy Wonka in disguise. Think on that. He knew all along that the poor boy deserved a chance at inheriting the factory, and saved the final ticket for him.