Does the number A113 mean anything to you? It does if you're a Pixar super-fan. That's the number of the classroom at CalArts where many of the Pixar animators started out—including Inside Out's director Pete Docter—and Pixar plugs it into all their flicks.

In Inside Out, it's the number of Riley's classroom and the number of the Train of Thought car that Joy, Sadness, and Bing Bong ride. It's even spray-painted on the side of a building in San Francisco.

These subtle little nods to the rest of the Pixar library that the animators hide here, there, and everywhere to reward their devoted fans are called Easter eggs, and Pixar films have more Easter eggs than a certain bunny who likes to take pictures with strange kids at the mall.

Here's just a taste of what you might spot on your re-watch of Inside Out:

• At Dream Production Studios, the gigantic legs of Ted the monster from Monsters, Inc., are lined up against the wall with other props.
• A cooking magazine on the Andersens' table features Chef Colette from Ratatouille on the cover.
• When Riley and her parents nosh on Chinese food, the boxes are the same brand (Manny's Chinese Cabinet of Metamorphosis) as the Chinese take-out boxes found in A Bug's Life, Monsters, Inc., Ratatouille, and Toy Story 2.
• Background memories contain sequences from a variety of Pixar joints, including the famous "Married Life" montage from the beginning of Up.

And that's only the beginning.

For more of Inside Out's Easter eggs, take a look at WhatCulture's list of 22 Easter eggs you may've missed, or peep Movie House's video video that collects 45 hidden references to other Pixar and Disney flicks.

If your mind's not sufficiently blown after all those sensational shout-outs, see where Jon Negroni, author of The Pixar Theory, thinks Inside Out fits into his "Grand Unifying Theory of Pixar Movies". Negroni's famous theory posits that every single Pixar movie is set in the same chronological universe with a unified timeline and central theme.

Yup. Every movie from Brave to Monsters University. You may want to order a Ted-sized cashew chicken and shrimp toast from Manny's Chinese Cabinet of Metamorphosis before you take a deep dive into that fascinating Pixar fan lore. Just sayin.'

And if that's still not enough, check out MIT (yes, that MIT) Media Lab's Inside Out fansite, chock full of games, art, and other random projects. You can even take a personality quiz to find out which Emotion you're most like. Fanpop's got a site, too, of course, complete with a quiz to let you know just how serious a fan you really are.

We suggest you take the quiz after you read this learning guide; you'll ace it for sure.