During the show there are songs performed in Russian language that have nothing to do with the historic period depicted in the show. An example of it is a children's choir singing a patriotic song about the Red Army during the dinner with the ambassador of Sweden. The Red Army did not exist until 1918, a year after the Russian Revolution. Another song featured in the show was about the fight of Soviet people against the Naazi Germany during the Great Patriotic War (1941-1945) and has been widely popular in the war-torn former USSR.
In multiple episodes, "macaroons" are referenced when characters are clearly eating macarons. Europeans know the difference.