Grim Adventures Of Billy And Mandy (the) Easter Egg - Dora the Adventurer

In the Pandora's Box chapter (I don't know the exact name), a new girl named Dora (PANDora) comes to Billy and Mandy's school. Now, take a very good look at her. It's actually Dora, the Explorer. I didn't notice it at the first time, but now i know it.