The design on Grady's skate Shows The Haunted Mask. Another Goosebumps villain
In Grady's room, there is a skateboard featuring the mask that is on the cover of The Haunted Mask.
Brendan Fletcher was in the Canadian werewolf films Ginger Snaps 2: Unleashed (2004) and Ginger Snaps Back: The Beginning (2004).
This episode is based on Goosebumps book #14.