* HeyItsThatVoice: The Faun is voiced by Creator/PabloAdan, a very successful Spaniard voice actor who was, among many others, the Spanish voice of [[WesternAnimation/{{Gargoyles}} Goliath]].
** HeyItsThatGuy: The Faun is ''played'' by del Toro regular Doug Jones, who had to speak his Spanish-language lines phonetically...''and his lip-movements are a perfect match to Pablo Adan's voice acting''.
* ImageSource: This film provides the page image for:
** EyesDoNotBelongThere
** SchmuckBanquet
* PlayingAgainstType: Much of the cast. Creator/SergiLopez (Captain Vidal) typically played slimy, arrogant creeps who were somewhat LaughablyEvil. Creator/AlexAngulo (Doctor Ferreiro) had been considered a lightweight comedic actor. Creator/MaribelVerdu (Mercedes) had played mostly love interests, and her most famous role (at least in the English-speaking world) had been Luisa CortÚs in ''Film/YTuMamaTambien''.
* WhatCouldHaveBeen: The first outline of the story was about an adult woman that found a hidden labyrinth behind an old house's bookcase. She would then be ''raped'' by a faun living inside the labyrinth, and as a result she would give birth to a magic-powered baby. Creator/GuillermoDelToro is ''that'' weird.
** That could have something to do with Ofelia's birth...
*** Seeing that Ofelia's true father is the King of the Underworld, not the Faun, that scenario is unlikely.
** This plot idea incidentally bears some resemblance to Creator/ArthurMachen's ''Literature/TheGreatGodPan''. The movie that happened ends up taking more influence from a different Machen story, ''Literature/TheWhitePeople'', which features a little girl associating with dangerous fairies.
** The Pale Man wasn't originally in the movie. The scene was originally meant to be Ofelia being tasked to retrieve a diamond from a sleeping dragon's hoard. The dragon would wake up when she removed a goblet from the hoard. It would then chase her, whilst ''speaking with Vidal's voice''.
*** This was a relic of an earlier draft, in which the boundaries between the material world and the fantasy one were much less clear cut. The idea was going to be that it was unclear which world was the "real" one.
** Del Toro's ''Cabinet of Curiosities'' (an art book that collects some of the director's sketches, complete with English translations) shows that one of the earlier incarnations of the Pale Man was a wooden doll in a tree.
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