iCarly Easter Egg - Reference to Roxy Hunter

On the episode when Carly, Freddie, Sam, and Mandy go down stairs, Mandy asks Carly why the drumset is there. Carly says, "I don't know why they are there," then Mandy says "It's a mystery."
This a reference to Roxy Hunter and the paranormal hour because the girl who plays Mandy Aria Wallace was Roxy Hunter the little detective.