According to Mike Myers, less than a month before the film was released, the producers had already begun plans for a sequel based on the book's sequel, The Cat in the Hat Comes Back. However, Audrey Geisel, the widow of Dr. Seuss decided to reject any future live-action adaptations of her husband's work, and the sequel was eventually canceled.
Among the props stolen from the production were an 8-foot pair of glasses, a 6-foot by 4-foot by 8-foot anvil, a 4-foot key and a golf ball 7 feet in diameter that weighed more the 200 pounds - total value: $55,000. The stolen props were later found at mall dumpster, covered in graffiti.
The pink-housed village was built especially for the movie in the Moorpark, California area, on a hillside just south of the 118 freeway. When it was first constructed many local residents complained to their elected officials that such an eyesore had been allowed to be built, but were assured that it was just a movie set built and that it would be torn down upon completion of filming which, by December 2002, it was.
The downtown area outdoor shots were filmed along a Pomona, California street where a number of antique and gift shops are located. The community decided not to redecorate after filming ended, so the surreal paint scheme and some of the signage can still be seen as it appears in the movie.
The Cat costume is made of Angora and human hair and was fitted with a cooling system. To keep Myers cool during the outdoor shoots, a portable air conditioner was available that connected a hose to the suit between shots. The tail and ears were battery operated.
This is the second film adaptation to a children's book from Dreamworks to star Mike Myers and feature two songs performed by Smash Mouth. The first being Shrek (2001) film, which was adapted from a picture book by William Steig and featured "All Star" and "I'm a Believer".
The Cat and his accessories (the Things, his lawyers, props) are the only things with the color scheme of white, red, and black. This was done so the Cat would pop out more in the movie as a colorful character.
EASTER EGG: In Sally's menu on the DVD, when the icon is on the hat symbol, push the right button. A symbol resembling a dog will appear next to Sally. Click it and a featurette about Nevins will play.
In an interview for the AV Club's "Random Roles" feature, Amy Hill said that Mike Myers was terrible to work with because he refused to talk to anyone on the production but director Bo Welch and completely isolated himself from the cast and crew during breaks in the filming. Hill noted that the film ended up having long and pointless additional takes of scenes because Myers overruled Welch on whether they were good enough or not.
The scene where the Things "clean" the house, moving the spots from one area to another, was inspired by the book sequel, The Cat in the Hat Comes Back, where the Cat moves cake stains from one spot to another.