Since its early days, Disney used the technique of rotoscoping / live-action reference, in which they filmed real actors performing
a scene and then traced over it frame by frame to create the animated version. While the animators did not copy line for line, the footage would help them visualize the postures and movements of the characters, resulting in a more realistic sequence.
“Cruella De Vil, Cruella De Vil. If she doesn’t scare you, no evil thing will. To see her is to take a sudden chill. Cruella, Cruella. She’s like a spider waiting for the kill. Look out for Cruella De Vil.”