The video from Oh My Disney doesn’t even make a reference to it, though the ball can be seen in a couple shots from Monsters Inc. The third consistent easter egg for Pixar is that each film they make references the next film they’re going to release.
If you’re a well-schooled fan of Pixar then you may already be aware of some of the standing easter eggs that Pixar places in all their films.
From there, however, we move fairly consistently through time, showing how each Pixar film referenced the one that came before it.
The video starts off with an Inside Out easter egg in Finding Dory, as it turns out that Riley visited the aquarium with her school class.