Goosebumps Easter Egg - The Haunted Mask

In the Goosebumps episode "The Werewolf Of Fever Swamp" if you look at the part where Grady and his family are done eating dinner, the next scene shows Grady's room. There is a skateboard and on the skateboard is a big sticker of the Goosebumps book "The Haunted Mask."