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Anachronisms
The song played at Tatiana's Naming Day feast - "On the Hills of Manchuria" - could not be played there, as the movie is set in the first half of the 19th century, and the song was written only in 1906 (and named after tragic events of the Russian-Japanese war of 1904-1905 years).
After Onegin throws Tatyana's letter onto the fire, the letter switches back and forth between different degrees of burn damage.
Ortodox Tatiana's Naming Day is January 26, but it is summertime in the movie.
The song played at Tatiana's Naming Day feast - "On the Hills of Manchuria" - could not be played there, as the movie is set in the first half of the 19th century, and the song was written only in 1906 (and named after tragic events of the Russian-Japanese war of 1904-1905 years).