You can see the stages of production for this scene. First storyboards, then art design.
All "props" - like the picket signs - must be mocked up & approved prior to animation
The mall workers are based on the Morlocks from H.G. Wells’ book, “The Time Machine.”
Jeff Bezos’ character is based on the Talosians, a species of aliens living on Talos IV from "Star Trek," the Original Series.
Check out the lyrics to the original song, “Unfulfilled,” written by Trey.