In order to save costs the 101 Dalmatians production team thought up an inventive way to animate Cruella De Vil's automobile. Instead of drawing the vehicle frame by frame the conventional way, a cardboard model was filmed, as effects animators moved it around in front of the camera. Note the black lines that define all edges.
Frames from this "live action" footage were xeroxed on to cels before being painted in the ink & paint apartment. (The same process was used for the Baduns' car, and later on for Edgar's motorcycle in The Aristocats.)
Art director and production designer Ken Anderson, story artist Bill Peet, and co directors Woolie Reitherman and Ham Luske play with a couple of toy car models.
Here the scene is being filmed in which Cruella tries to run the Baduns off the road.
Effects animator Dick Lukas is manipulating the models.
Woolie Reitherman moves Cruella's car up a snowy embankment set up. Even the movement of the simulated snow made it in to the final film.
Some people might consider this whole procedure a cheat. I think it is pretty ingenious, considering that these guys were under the gun as far as having to bring down the film's budget.