Continuity mistake: When Mercedes flees through the forest to escape the soldiers, the blood pattern, thickness and color of blood on her face changes between shots. (01:33:00 - 01:35:30)
Continuity mistake: As Mercedes flees after cutting the captain, her hair is done up in a braid, but in the next shot her hair is down and flowing. (01:34:05)
Continuity mistake: When the Captain is stitching his facial wound, the camera pans down to Ofelia hiding by his table, revealing that there is no blood on the Captain's clothing. Seconds later, the Captain approaches the table wearing bloodstained clothing (from the earlier scene with Mercedes). (01:38:20 - 01:39:05)
Continuity mistake: The Captain has a piece of gauze on his wounded cheek, and over time, the gauze has a small amount of blood, to a lot, back to a little, and back and forth.
Answer: I saw nothing in the movie indicating that. Ofelia's task seemed to be to retrieve the blade, she failed because she didn't follow Pan's instructions about not touching the food.
Andreas[DK]