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The Pizza Planet truck from "Toy Story" made an appearance (just as it does in every Pixar movie), but there were also references to "Inside Out," "Wall-E," and possibly even "Fantasia 2000."
The movie also referenced real-life historical icons, and one of the movie composer's band, Nine Inch Nails.
Keep reading to see the best details you might have missed in "Soul."
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After Joe lands the jazz club gig, he passes by a hardware store selling 9-inch nails. This is a sneaky reference to the movie's composers.
Joe passing by the hardware store.
Disney
In the You Seminar, one of the Jerrys introduces soul number 108,210,121,415 - which is close to the exact number of people who have ever lived on Earth.
The Jerry onstage at the You Seminar.
Disney
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The "Luxo, Jr." lamp from Pixar's very first animated short is in the Hall of Everything.
Luxo Jr.
Disney
There are many more Pixar-related Easter eggs in the Hall of Everything, including the "A113" reference on a street sign.
A113 was in the far background of one "Soul" scene.
Disney
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Other Pixar and Disney-related objects in the Hall of Everything include the spaceship from "Wall-E" and the Pizza Planet truck from "Toy Story."
Joe and 22 entering the Hall of Everything.
Disney
When Joe tries to get 22 to like pizza in the Hall of Everything, a familiar looking topping option is on the top shelf.
The pizza stand in "Soul."
Disney
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While Joe is helping 22 conduct scientific experiments to find their "spark," the chalkboard behind them has a real chemical compound written on it.
The chalkboard in "Soul."
Disney
Joe pauses to look at the wall of nametags left behind by 22's former mentors, and you can see several notable names there.
The wall of past-mentors.
Disney
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Another "Luxo, Jr." reference was tucked in the background of 22's secret box.
22 and Joe inside her box.
Disney
When Joe (trapped in the body of a cat) passes a rat carrying pizza, "Soul" was making a reference to the viral video of a rat dragging a slice of pizza down New York City stairs.
Joe and the pizza rat.
Disney
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Every Pixar movie contains a small hint about the next film planned by the studio, and "Soul" is no different. A travel poster Joe and 22 pass by is a tease for "Luca."
The poster in a window of a travel agency in Queens.
Disney
"Soul" codirector Pete Doctor's 2001 movie "Monsters Inc." also gets its own Easter egg in this film.
The subway car in "Soul."
Disney
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Inside the subway, you can get a partial look at ads for the fictional startup company called Brang - which was featured in "Inside Out."
A Brang ad in "Soul," and on Riley's dad's shirt.
Disney