The error that appeared in the book and was passed in the movie: Belash comes to Leningrad nonexistent passing train "Yerevan-Murmansk", actually surpassing even the "Red Arrow".
In the film the phrase is uttered, "Nicolo Amati was sure of his impending death, but the days passed, he lived for another seventeen years and created immortal Trianon ensemble - two cellos, six violas and violins eighteen for the orchestra of the Charles IX of France".