These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: Many of the historical figures in this show differ in terms of popularly accepted behaviours of their Real Life counterparts. Most notable perhaps are the king and queen of France, Louis and Marie.
When Telliagory dies from a bullet wound he makes a comment about the irony that he lived too long to "die by the sword," since he had lived by one for so long. It seems like another example of his gently dark sense of humor, until you realize what he said to Durand's corpse: "I hope I die like you." Durand died in a swordfight, like an old-school knight. Thus Telliagory's last words are actually a lament for the end of French chivalry.
The opening sequence shows Robin shooting through the royal crest. This seems like it was done simply because it looks cool; but in the final episode, Robin changes his name to Robespierre and becomes the leader of the French Revolution. Only after seeing the entire series do you realize what that scene was actually symbolizing.
Fridge Logic: So if Maximilien and Lia are half-siblings because they share the same father and Max's father was Louis XIV, does that mean D'Eon is also the son of Louis XIV and is thus the remaining heir to the throne after Maximilien dies?
History would disagree, unless Prince Auguste/eventually Louis XVI does not have younger brothers in this timeline. (After the fall of Napoleon, Louis XVI's younger brother Louis XVIII comes onto the throne, followed in turn by his younger brother Charles X.)
But honestly how are D'Eon and Lia connected? Did Lia's and D'Eon's mother become Louis XIV's mistress, give birth to Lia, then marry some backwater knight called de Beaumont and have D'Eon with that knight? I mean this is really the only sensible explanation, because otherwise either D'Eon has to the son of Louis XIV or he's not connected by blood to Lia, which by the way has some other fridge logic implications.