- Revealing mistakes: When Jared is pulling himself up the dumbwaiter for the first time, in one shot the dumbwaiter is continuously moving up. The dumbwaiter only moves when he pulls the rope, but it keeps moving in between pulls.
- Revealing mistakes: When it first appears that the goblins are roasting a cat, the fire is moving in reverse motion.
- Revealing mistakes: When Mallory and Jared are fighting at the beginning, Jared can be clearly seen to mouth Mallory's words.
- Errors made by characters (possibly deliberate errors by the filmmakers): When Jared and Simon are looking at the photo of Arthur Spiderwick they refer to Spiderwick's daughter, Lucinda, as their aunt. However, they called Spiderwick their "great-great uncle". That being the case Lucinda was not their aunt. She would actually be a distant cousin to them. Technically she would be a cousin twice removed as she would be first cousin to whichever grandparent of theirs who was the niece or nephew of Arthur Spiderwick.
- Continuity: Durring the fight scene in the house, Jarred throws several tomato bombs at the invaders. He is shown having only 1 in his hand throughout the scene. But when he throws the bomb and new one appears in his hand.
- Continuity: While fighting the goblins in their house, Helen (Jarred, Mallory, and Simon's mother) does not have the sight. Half way through the fighting, the seeing stone disappears from her face, yet she can still see all of the creatures and continue fighting.
- Continuity: In order to kill a goblin from above, Jared pops a bag full of tomato sauce on it. He holds the bag over his head but there is no sauce on him in the next shot.
- Errors made by characters (possibly deliberate errors by the filmmakers): Aunt Lucie has an American accent as a young girl in the flashback but a British accent as an old woman.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: After Jared and Mallory visit Lucinda, back at the house when Mallory takes Jared outside to show that the goblins are gone, she is not using the seeing stone. Then she reacts when Hogsqueal approaches as if she can see him but in the next shot she acts like she can't see him.
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