Other mistake: In the first Twilight, vampires bones break like normal humans, as demonstrated when Alice breaks James's neck. In New Moon, they break like concrete, as the man whose head the Volturi ripped off has a grey stump. In Eclipse, lots of vampires lose bodyparts in the big battle, and they all break like ice, as they have white shiny stumps. In Breaking Dawn Part 2, lots of vampires lose bodyparts in the imagined battle, and they break like china, as they have brown stumps.
MikeH
13th Apr 2015