* PreOrderBonus: A truly ridiculous number of them, based on what region you're from and from what venue you're making your purchase.
* WhatCouldHaveBeen: [[http://www.gamespot.com/events/gdc-2013/story.html?sid=6406136 The game was originally meant]] to take place in the [[RealLife real world]] in feudal Japan. The developers then realized they didn't know enough about feudal Japan, so they then [[WriteWhatYouKnow changed location]] to the great London fire of 1666, but then they decided that there had been too many changes to the setting to be realistic and set the game in an ConstructedWorld. Another significant change was removing the ability to throw random objects around at will because according to Arkane, this meant that players could throw an object, freeze time, and then hop on the thrown object in midair, which would have [[GameBreaker broken the game.]]
** At one point during production, Harvey Smith and Ralph Colantanio wanted Corvo to be voiced but the game was too far in development to make this a possibility. The regret over Corvo not being voiced led to the Daud DLC where the protagonist is voiced and the developers have stated that the sequel will have both its protagonists voicing the characters.