Trivia: Another comic book reference: they both have signature colors. Mr Glass' color is purple (his clothes, the envelope he leaves on the windshield, interior of his house, etc.) while David's is green (all of the interior in his house, his raincoat, his suit on the train etc.).
Trivia: There is a theme of upside down being bad. The girl in the train stands on her head before the crash. The son is watching TV upside down. When Mr Glass falls down he falls on his back and sees the figure he is chasing upside down. When Bruce Willis breaks into the train wreck, the warning sign in the gates are upside down. Willis falls head first into the pool. The comic book given to Elijah is first viewed... you guessed it upside down! Not a mistake, but great directing.
Elijah Price: Now that we know who you are, I know who I am. I'm not a mistake. In the comics, you know how you can tell who the arch-villain is going to be? He's the exact opposite of the hero. And sometimes they're friends, just like you and me. I should have known way back when. You know why, David? Because of the kids. They called me Mr. Glass.