Unbreakable/Fridge

Fridge Brilliance

 * The first time we see adult Elijah, he's talking about a comic book artist drawing villains with disproportionately-large heads. The way the scene is shot, we only see his reflection in the picture he's describing.
 * In the same scene, he also says superheroes often have a slack jaw. In this film, the hero is played by Bruce Willis, and near the the end of the film, this is what he becomes.
 * During the conversation where Elijah asks David about his ability to detect evil-doers by sheer intuition, only in retrospect do we realize
 * David's Kryptonite Factor is because the increased density of his bones
 * The fact that may not be apparent to some viewers, even after the Twist Ending.

Fridge Logic

 * There have been numerous accidents in history with only one survivor,
 * . Being completely uninjured by a train wreck, displaying mild psychic aptitude towards human iniquity and the ability to perform feats of superhuman physicality are probably what set him apart from the rest.