After Euphemia chooses Suzaku as her knight, Cornelia calls her to scold her about it, saying that if she wants to change the system, she can do so if she becomes Empress. That happens toward the end of Nightmare of Nunnally, with Cornelia's approval.
Kallen's claim in episode 19 that Euphemia is a useless puppet princess of Britannia who can't make any decisions of her own. Episodes later, Euphie gets killed after being accidentally mind controlled and stripped of her free will. Could be considered Harsher in Hindsight too.
During the Guren's first taste of battle, Jeremiah says it's impossible for Elevens to have created such a powerful war machine, dismissing the notion that the Japanese are capable of creating hi-tech weapons.
Some memes on the internet link the story of the series about an inefficient European Union on the brink of collapse and a modern British empire, and the fight of some people against a corrupt British establishment, to the Brexit Referendum.
Following the passing of Queen Elizabeth II Great Britain now has a monarch titled King Charles III.
