- Awesome Art: The illustrations of the Field Guide are absolutely stunning.
- Complete Monster: Mulgarath is an arrogant, cunning Ogre who was directly or indirectly responsible for nearly all problems that befell the Spiderwick and Grace families. Desiring Arthur Spiderwick's field guide to conquer mankind and the other fairies, Mulgarath had Arthur's daughter, Lucinda Spiderwick, kidnapped, then tortured and later crippled when she couldn't give it to him. In preparation for his plans, Mulgarath built himself an army held together by intimidation, including press-ganged goblins; acquired several dragons; and played on the dwarves' love of metal and craftsmanship to convince them to build weapons for his army and to swear their eternal allegiance to him. Mulgarath rewarded this service by massacring all the dwarves the moment they gave him the weapons. Upon learning that Jared Grace had found the guide, Mulgarath turned his attention upon the Grace siblings, happy to kidnap and kill the children to gain the guide, his plots climaxing in him destroying their family home and kidnapping their mother. Ambitious and vain as he was, Mulgarath was also a sadistic beast, as inside his palace the Grace siblings found multiple fairies he had imprisoned in honey and left to struggle futilely as they slowly drowned.
- Family-Unfriendly Aesop: In book 2 of ''Beyond The Spiderwick Chronicles, Laurie explains that she lies because "lying works," and nothing in the story contradicts this claim. This, from a book aimed at 6-12 year olds.
- Hilarious in Hindsight: So let me get this straight; this is about a pair of preteen twins who discover an old journal, which was written by a relative who disappeared years ago, that doubles as a guide to the secret mystical world around them? That sounds awfully familiar...
- Paranoia Fuel: The idea of being surrounded by invisible creatures who you aren't aware of, many of whom are actively malicious... it doesn't help that the authors of the books claim that the story is real in the introductions.
YMMV / The Spiderwick Chronicles