- The design of the guillotine is weirdly similar to the hidden blade. The hidden blade, held horizontally on the wrist, protrudes in a forward straight direction by a spring mechanism and is meant to insta-kill target and give them quick deaths. The guillotine was designed as a humane alternative to more cruel forms of capital punishment such as drawing and quartering, breaking on the wheel and likewise it has a mechanical lever mechanism that brings the blade down at great speed to instantly kills a person and so minimize pain. If you miniaturize the guillotine and hold it horizontally it might be similar to the hidden blade itself. The ACU logo, features the Guillotine Blade between the A, further honing the connection. The main difference is that the Hidden Blade is concealed, while guillotine is the national razor.
- Arno sports a Blue Longcoat, a White vest and a Red Cravat, he's a walking French tricolor.
- In a previous game, two characters discuss how Templars and Assassins have never been able to work together. In particular, one character mentions that the two sides "have never been able to achieve unity." One of the early trailers for this game reveals an Assassin freeing and fighting alongside a Templar, a nice bit of foreshadowing.
- Tied in with Assassin's Creed: Rogue, the ending of the latter has Shay talk about how the Templars need to start their own revolution. Which means that in a backhanded way, the Assassins did start the French Revolution.
- Why is Arno's Eagle Vision only available in short bursts? Since he isn't one of Desmond's ancestors, he doesn't have as much First Civilization DNA in his system as Altair, Ezio, and the Kenways do. Also, the Helix system is a gaming console, not a fully operational Animus, so players only have access to First Civ abilities in short bursts.
- We've seen Assassin Councils before, namely in Brotherhood, where Machiavelli led but the rest of the Master Assassins were largely independent. The French Assassin Council seems much closer to a system of voting than those in the past, with Mirabeau still having some degree of veto power over them. The idea of a Council with a figure of greater authority over them with occasional veto powers bears resemblance to a constitutional monarchy, something Mirabeau advocated for greatly in Real Life.
- The reason why Sequence 11, Memory 01 ("Bottom of the Barrel") was in such a strange blue tint was because Arno was severely depressed at that time after getting kicked out of the Brotherhood and falling out with Elise. The Animus not only allows us to relive genetic memories, but get an insight into the emotional state of the person while they were making those memories.
Fridge / Assassin's Creed: Unity