* DyeingForYourArt: Gerard dyeing his hair to mimic the DiseaseBleach of the album's titular character.
* HeyItsThatGuy: HEY, "[[http://en.wikipedia.org/wiki/Lukas_Haas IT'S THAT DUDE]] from MarsAttacks!" in the video for "Welcome to the Black Parade". [[ParentalBonus Some were remembering the little Amish kid from ''Witness'' instead.]]
** Also, Liza Minelli plays Mama.
* HeyItsThatVoice: See "Hey, It's That Guy!"
* WhatCouldHaveBeen: For a long time it was believed there would be a video for "Mama". There wasn't. Cut to some time later when an article surfaced describing that there had been discussion and even a concept for a "Mama" video, involving GrantMorrison as the Devil and Liza Minnelli dressed as the Virgin Mary.