Steven Universe - *Cough* Totally not the creator *Cough*

They just shattered the 4th wall harder than Rose did Pink Diamond.

It's not her, though. Production is done in the United States, and the animation is done in Korea. The production team (which includes Rebecca) sends the references (like that character sheet of Greg in the screenshot), storyboards and such to the animators in Korea, then the finished episode is sent back to the US.