Ever wonder why Cruella's car looks so weird in One Hundred and One Dalmatians?

Back in the '60s, Disney animators were using Xerox camera technology to translate pencil drawings on paper into line work on cels, which replaced the beautiful, traditional hand-painted cels in order to save money on creating animated films. During the production of the film, the studio came up with an idea on how to animate Cruella's Car, the animators built an actual white model of her car out of cardboard with bold black lines on the edges. That's drawn on the edge of the model.

So the Disney animators built a car out of cardboard and put black lines around the edges. Then they made the wheels articulate, they would take a long piece of cloth and tape little pieces of wooden dowling underneath it, and then put the car on top of the cloth, suspend it from a kite string, and then pull this long piece of fabric, with pieces of wooden dowling underneath the wheels, they shoot a take of that.

Because of the strings, model would rumble and so forth.

Then the clips were transferred directly into a xerox plate. They were printed, and what we see in Cruella's car, is that model zipping around. When Cruella is seen driving her car up the hill of snow, a sand-like substance was used for it to drive through and shot it all in slow motion.

The process of shooting models with those black outlines worked very successful when making One Hundred and One Dalmatians and it was a clever idea to save money. The current status of the original model of Cruella's car remains in storage, mostly fully intact.

Ub Iwerks idea.

Source: Disney wiki and 101 Dalmatians Diamond edition.

~ Cinderella