Amantius Allectus' Diary, stolen during "May The Best Thief Win" may be a reference to the movie and musical "Little Shop of Horrors". The diary notes Allectus' cultivation of plants that feed on blood. He begins by feeding them cat and rat blood, but once he accidentally cuts himself on the plant, they begin craving human blood, which he then feeds them. In "Little Shop", the main character Seymour cares for a blood-thirsty plant who, once accidentally cutting himself on it, begins to feed it his own blood.
Contributed by ClaudX