At 10', when Bash shows Delphine the palace, we can see a big conical cake covered with macarons.
The producers probably wanted to pay a tribute to Catherine de Medici, who introduced the macaron to the french gastronomy in 1533.
The problem is they used the two-by-two macarons as we know them today. At the 16th century they baked them as a single cookie, probably with no color at all. Historians say the macarons filled with jam or ganache were created only after the 1830s.