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In Toy Story 3, one of the girls at the Sunnyside Daycare is a slightly older Boo from Monsters, Inc.

Boo from Monsters, Inc makes a cameo in Toy Story 4 - Look to the right of Bonnie in the background! : r/Pixar

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Toy Story 3 - Playtime At Bonnie's [HD], via .

Toy Story 4 Easter Egg Monsters inc boo, Monsters inc, Monster university

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Monsters, Inc. : John Goodman, Billy Crystal, James Coburn, Steve Buscemi, Mary Gibbs, Bob Peterson, Jennifer Tilly, Bonnie Hunt, Frank Oz, John Ratzenberger, Daniel R. Gerson, Jeff Pidgeon, Sam Penguin Black