The Cheshire Cat was created using a mix of puppetry and CGI. The Cat's body was puppetry, but its face had Whoopi Goldberg's face digitally scanned and composed on it.
Part of the series features events from Lewis Carroll's second Wonderland book "Through the Looking-Glass." These events include Alice stepping through a mirror and the appearances of the White Knight, Tiger Lily and the talking flowers, Tweedledum and Tweedledee, the Walrus and the Carpenter, and the Red King.
Most of the Wonderland residents appear at the start/end of the series as guests at a party. This double casting, as well as reinforcing Alice's dream-like perception, is a homage to writer Lewis Carroll having based his characters upon people he personally knew.
Alice offers up "lions and unicorns" as a possible password for Wonderland. "The Lion and the Unicorn" was a rhyme that appeared in "Through the Looking-Glass."
In Sir John Tenniel's illustrations for the Alice in Wonderland book, and most other movie adaptations, the Mock Turtle is a cow in a turtle's shell. This was because mock turtle soup (for those who couldn't afford to have real turtle soup) was generally made from veal. In this version the Mock Turtle is portrayed as a man in a turtle's shell, rendering the name meaningless.
Three versions of the White Rabbit's house were built: a pop-up cardboard model which unfolded from the book, a life-size set, and a miniature set for when a gigantic Alice gets stuck inside.
The scene where Alice finds herself growing bigger as she walks down a corridor was shot on a corridor that was constructed to get smaller, which reinforced the illusion on camera.