The red dot is a classical bouncing ball evolving over time (it's pretty boring comparatively). On the left is a plot of the probability of finding the particle at a certain height (the vertical axis) at any given time of the movie. The quantum particle does sort of bounce, become kind of wavy and messy, and then bounces again, but out of phase with the classical ball.
TL;DR: Cool animation of doing mundane physics with a quantum system with results that are anything but mundane. Click the links to have your mind blown.