This episode is based on Goosebumps book #14.
In Grady's room, there is a skateboard featuring the mask that is on the cover of The Haunted Mask.
These two episodes were originally broadcast as a one-hour special during prime time.
In the United Kingdom, Goosebumps is usually rated PG for scary scenes and mild supernatural threat (and, depending on the episode, scenes of bullying, mild violence, and dangerous, imitable behavior). However, this episode was given a 12 rating due to moderate supernatural threat and animal violence (both seen and implied).