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. Elijah's hair makes his head look oversized.
- 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 has seated Elijah in the yellow section, which is one of the colours that shows up around evil-doers.
- David's Kryptonite Factor is drowning because the increased density of his bones makes him less buoyant than other people, and thus he tends to sink and drown easier.
- The fact that "Mr. Glass" is exactly the sort of name a comic book supervillain would have may not be apparent to some viewers, even after the Twist Ending.

There have been numerous accidents in history with only one survivor, this doesn't prove the survivor is a superhero, as the villain in the story would like to believe.
- Mr. Glass knew this. 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.