Mistakes and Grammar

[Matt]

No: HPFGUIDX 138649

I almost always enjoy the word choice in the dialogue Rowling writes
for Dumbledore, and "huger" was no exception.  Dumbledore's prose is
poetic, but without taking itself too seriously (look back at the
paragraph immediately prior to the "huger mistakes" reference, where
Dumbledore follows up a sentence chock full of classical rhetorical
devices -- metaphor, alliteration, doubled tricolon -- with a comic
reference to Humphrey Belcher's cheese cauldrons).  The use of "huger"
fits that same pattern: Dumbledore picks a simple and common
descriptor ("huge"), but uses it in an uncommon construction,
demonstrating the thought he puts into his choice of words.  

It didn't strike me as odd or grammatically questionable.  Geoff is
right that "huge" is very rarely used in comparative form, but it has
had some use in the superlative, including perhaps most famously
Milton's description of Leviathan in Paradise Lost as "Hugest of
living Creatures."  (Melville, possibly in homage to Milton, also
picked up that descriptor in Moby Dick.)

-- Matt