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In the episode My Clique (#1.12) Chloe is watching an episode of Adventure Time (2010) while studying. Chloe's mom is voiced by Niki Yang, who voiced multiple characters in Adventure Time including Korean speaking Lady Rainicorn.
Nobody calls Ice Bear by name, except for Ice Bear himself.
Estelle, the voice of Garnet in the Cartoon Network series named Steven Universe (2013), also sings the theme song for We Bare Bears.
The first Cartoon Network show to be based on a webcomic.
Ice Bear is the youngest, Panda is the middle, Grizz is the oldest.