Discworld/Maskerade/YMMV


 * Shocking Swerve: There isn't much buildup for The Reveal that, and  's motivations do not make any sense whatsoever (he has been stealing lots of money, but that's more due to clever accounting than his antics as the Ghost). However, this is amidst characters saying that nothing in opera makes sense and it comes across as extraordinarily meta, especially with the scene mentioned under Lampshade Hanging.
 * It would seem that he was originally trying to frame for his actions to cover the tracks, and use the murders to do so, but getting badly carried away in the process.
 * And the villain pretty much explains at the end that the murders were because the victims had found out his identity; the rat catcher was blackmailing him and the music director had seen him.
 * And when asked why he didn't just leave the opera, as that would solve all his problems, he simply acts like that would be inconceivable, and doesn't get a chance to elaborate further.