It's no secret that Pixar has been hiding little nods at their hugely successful history throughout their canon of films. There are the obvious references, like nods to past films such as the original Toy Story's Pizza Planet Truck (it pops up in every single film Pixar has released excluding The Incredibles—yes, it even appears in Brave and The Good Dinosaur). And maybe you've noticed the consistent appearances of "A113," but didn't realize this is the classroom number at the California Institute of the Arts where many Pixar staff members got their start.
Many fan videos have highlighted these easter eggs in the past, but earlier today, Pixar released an official video compilation of these easter eggs for the first time.
It's certainly not a complete rundown of every easter egg they've thrown into their films, but Pixar gives us a blend of those easier references mixed with some of the harder ones to catch. We're not sure anyone could have placed Riley from Inside Out as one of the children eagerly viewing an aquarium in Finding Dory.