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* ActorSharedBackground: Edward Kenway wasn't originally intended to be Welsh, but then the developers heard voice actor Matt Ryan's native Welsh accent.
** Adéwalé states that he was born in Trinidad, a nod to Tristan D. Lalla's heritage.
* HeyItsThatVoice: Anne Bonny is [[Film/TheGuard Sinead]].
** Edward is John {{Series/Constantine}}.
* RealitySubtext: The MacGuffin in this game is, for all intents and purposes, [[PalantirPloy magical NSA]], with the Templars believing that it would help bring justice and order to the world. Which is ironic, since the PRISM scandal broke when this game was well into development.
* WhatCouldHaveBeen:
** El Tiburon was apparently more prominent in early versions, with him and Edward having a one-sided HopelessBossFight even, as per [[WordOfGod Darby McDevitt]] which is what Edward refers to at the end in the game.
** According to [[WordOfGod Darby McDevitt]] Edward was originally going to end up [[spoiler: witnessing Mary Read and Anne Bonny fighting off the British Navy. In the final game, Edward witnesses their sentencing and their pleading their bellies and eventually Mary's death.]]
** Recall on how in every other game you can summon your recruits during a battle to help? Sadly despite being able to recruit a fleet of ships their only purpose is to do missions via a map in the ship. Such a shame you [[NoKillLikeOverkill can't summon 12 Lv 60 Man of Wars to go after a schooner]].
** It could have been ''Elite'' but with Pirates (and, of course, some Assassin/Templar stuff). Unfortunately the fact there are only five commodities which always sell for the same price and your ability to sell them and buy ship upgrades without going anywhere near a port spoil this.
** Remember the awesome Homestead sidequests in ACIII that gave the game a surprisingly personable feel? Well, that's gone. Instead of building an awesome pirate hideout - which is perfectly possible, as a base one is given to you pretty early on - you just buy different shops you want.
** The original ideas for DLC was to an AlternateUniverse "Devils of the Caribbean"(after the cheesy in-game trailer) that would feature the Pirate tropes the game makes fun of - bad accents, parrots, krakens - similar to the "Tyranny of King Washington" DLC. Likewise before doing an Adewale based "Freedom Cry", they considered making DLC for "James Kidd/Mary Read".
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