A werewolf monster terrorizes the Burlington library, and when the gang ends up there after an avalanche, they seek to solve the mystery.
The episode provides examples of:
- All Just a Dream: Velma says this to Fred and Scooby in order to snap them out of the shock of seeing Shaggy and Daphne together. Surprisingly it works.
- All There in the Manual: The Fiend is only named as such in the credits.
- Cabin Fever: Hinted at for the motive of the villain. He's been in that library his entire lifenote , and has never been allowed leave even for a single day of it, freezing the entire time. He just wanted the library shut down so he would finally be able to go somewhere warm.
- Continuity Nod:
- Dude, Not Funny!: Velma gets this response for joking that nobody would notice the difference if Fred and Scooby lost their minds forever.
- Expy: Dan Fluunk is an Expy of Dick Halloran from The Shining.
- Fanservice: Daphne's Shower Scene.
- Foreshadowing : Immediately after shaking off the monster chasing her, Daphne enters a room where Fred is sitting, who asks her "Like, what's wrong Daphne?" This is a big clue-in that it's actually Shaggy.
- Funny Foreigner: Don Fong, from "an unspecified foreign culture."
- Generation Xerox: Of the non-familial kind—as it turns out, each generation has at least one group of four people (usually two guys and two girls, and they're usually teenagers) and some kind of animal mascot who're a mystery-solving group, and the previous two groups were involved with the mysterious conquistador treasure. And it turns out the Darrow family from last season is one of them.
- Ghost Train: Velma hallucinates one of these steaming through the library, with the Benevolent Lodge of Mystery on board.
- Kissing Under the Influence: Daphne and Shaggy end up kissing while under the influence of the terror wood smoke. At the time both were under the hallucination that Shaggy was Fred.
- Modesty Towel: Daphne steps out of the shower in a towel and is soon attacked by what looks like a giant Medusa. Curiously, before she runs out of the bathroom, she also throws a robe over her modesty towel.
- Monster of the Week: The Fiend, a green lycanthropic creature that haunts the Burlington library.
- Mushroom Samba: Let's not beat around the bush, the "terror wood smoke that causes terrifying hallucinations" is basically a psychotropic drug.
- Not Helping Your Case: After Daphne says nothing happened between her and Shaggy, he adds that nothing but the kiss happened. He himself admits he's not helping.
- On One Condition: As per the wishes of the Burlington Library's founder, if it ever closes, its contents must go to Darrow University.
- Series Continuity Error: Dan Fluunk states that Oswald P. Burlington, who lived in the 1880s, specified that his library should stay open in perpetuity and that should it close its contents were to be donated to Darrow University... but previous episodes established that Darrow University wasn't built until after the Darrow Manor sank into the ground 75 years before the show takes place.
- Shout-Out: Of all the animal statues the humungous library could have had it just happens to be an orangutan?
- Unishment: The villain doesn't mind going to prison. In fact, they regard it as an improvement, since at least they'll be someplace warm.
- Wham Shot: Just after we see Daphne lock lips with what appears to be Fred, the scene shifts to Scooby working on the van outside... and the real Fred is still there with him.
- Whole-Plot Reference: The episode's plot is heavily influenced by The Shining and has several scenes taken from the movie.
- Cassidy: The Darrow family aka the Mystery Fellowship. It's all happened before, Velma. Now what you got to do is figure out why.
