After bratty Eustace gets changed into a dragon, he learns his lesson about being more grateful for what he has and Aslan shows up to change him back. The scene is essentially the same in both the book and the movie, with just one difference.
In the movie, Aslan claws at the sand three times, which causes Eustace’s scales to slowly tear away. He then roars, and Eustace is fully changed back to a boy.
In the book, Aslan first tells Eustace to “undress”. Eustace starts clawing at his own dragon skin, which starts peeling off. He keeps tearing away layers of his skin until he gives up, seeing no significant change. Then Aslan steps in and starts clawing at his body, tearing away more skin.
While the movie shows dazzling golden light as the skin transforms, the book is much more literal. Eustace says it “hurt worse than anything I’ve ever felt,” and compares it to peeling off a scab. Since the whole thing is one big metaphor anyway, it makes sense why the filmmakers made the changes they did. You can check out the movie version here.
Source: https://www.buzzfeed.com/williambarrios/book-scenes-cut-from-movie-adaptations
