The Caster Chronicles have some nominal similarities to the Twilight Saga, e.g. they're both set in a small town; a relationship between a human and a supernatural being; the human drawn into a vampire/witch war with their families, etc. But the two series have they're differences as well, e.g. the novel Beautiful Creatures pointedly says there are no such things as vampires and werewolves, both of which appear in the Twilight Saga; Stephenie Meyer promoted chastity and the sanctity of marriage, while Beautiful Creatures favours tolerance and understanding of anything different, etc.
All the caster's have different types of basic caster powers. Lena is a Natural (can control the weather and elements), Ridley is a Siren (can control and influence people), Sarafine is a Cataclyst (a Natural except dark), Aunt Del is a Palimpsest (someone who reads time), Gramma is an Empath (can copy another casters powers for a short time), Genevieve was also a Natural/Cataclyst, and Macon has a form of telepathy.
When Ethan first finds the locket at Greenbriar, it is engraved with two sets of initials in a simple script font. When Ethan first gives the locket to Lena, the initials are the same, but the script is much more intricate and elegant.
Gatlin is a fictional town, but the Battle of Honey Hill was a real Civil War battle in South Carolina. The film gives the wrong date for it: December 21, 1864. It actually took place November 30, 1864.
Ethan Wate: I'm agreeing with you! Ok, I'm just a dumb ass mortal who can't make his own thunder, but I know there's no way were gonna figure this out unless you stop feeling so damn sorry for yourself! Go ahead! Start an earthquake, see where that gets you.