community - What was the inspiration for the trampoline storyline in "Aerodynamics of Gender"?

It was inspired by The Secret Garden. It's a book I'm not familiar with, but The Onion's AV Club says:

This trampoline storyline was like something out of Simpsons, almost directly. (That show also had a famous trampoline B-story.) However, Community makes its own story out of this basic premise by weaving together the idea of trampolines being hideously unsafe with an elaborate parody of The Secret Garden (complete with lush imagery out of the final season of Lost) and the end of every story where people discover paradise but then ruin it by ... leading other people to it.

_{emphasis mine}

Reading over the Wikipedia summary of The Secret Garden, there are some obvious parallels. The servants who introduce the protagonist to the garden, parallels the janitor in the Community episode. Both works share the lush greenery, and the gardens in both share magical properties.