Answer: There is no "unbirthday" party in the novel. (This is a look-glass concept, and what Alice found there. The Mad Hatter, the March Hare, and the Dormous had a never-ending tea party because the Mad Hatter has a quarrel with Time. vs In the movie, The Mad Hatter, the March Hare, and the Dormouse are celebrating at an Unbirthday party rather than a never-ending tea party. The White Rabbit's clock is broken that the Mad Hatter and The March Hare "fix" it. In the book, Tweedledee and Tweedledum and the talking flowers never appear; they are characters from Lewis Carroll's other novel, Through the Looking-Glass, and What Alice Found There. vs In the movie, Tweedledee and Tweedledum and the talking flowers are incorporated into the original plot from Alice's Adventures in Wonderland. In the book, Alice eats little cakes in the White Rabbit's house to become smaller. vs In the movie, Alice eats carrots from The White Rabbit's garden to become smaller. In the book, the Caterpillar crawls away from Alice. vs In the movie, the Caterpillar turns into a butterfly.
Source: aliceinwonderland.fandom.com
