The characters attend an opera production of "Marriage of Figaro" in 1811.
Even though the opera was written in 1786, it did not premiere in Russia until 1836.
The Incidental music to Masquerade was written in 1941 by Aram Khachaturian for a production of a play of the same name by Russian poet and playwright Mikhail Lermontov. It premiered on 21 June 1941 in the Vakhtangov Theatre in Moscow. However, in the series, this waltz is danced to in 1813 by Andrei and Natasha, more than 100 years before it was originally composed.