** The reason why the Queens are very - ahem, ''controlling'' with regard to the [=ExtraOrdinary=] Wizards is because [[spoiler:they are in charge of the safety of the Castle, and as such, they have to keep an eye to the actions of the Wizards, as they are often marked by an [[PoorCommunicationKills appalling lack of safety policy]].]]
** The isle of Syren in ''Syren'' was sunk by the [[http://en.wikipedia.org/wiki/Storegga_Slide Storegga tsunami]].
** Marcia, after reading Septimus's note saying that he is now Marcellus's apprentice, says that it had his signature, which was a seven. This makes sense if you remember that Septimus is a MagicalSeventhSon.
*** His name also means "seven".
** If the Gathering of Extraordinaries in ''Quest'' can only be official if it is complete, how come nobody points out that Hotep-Ra isn't there?
*** Simple. [[spoiler: He's not dead. Though it is worth noting that they apparently don't ''know'' this. When Septimus tells the ghost of Julius Fye in ''Fyre'' that he met Hotep-Ra, Fye at first thinks that Septimus met Hotep-Ra's ghost.]]