The scene at the end of the movie where Joseph Stalin appears in Berlin never occurred. After seeing this in the film, Stalin told the filmmaker that he had wished he had gone to Berlin.
A scene where Stalin gives advice to Alyosha on how to win Natasha was later cut out of the film, because Lavrentiy Beria, Stalin's head of the secret police who was disgraced under Khruschev, was in the scene.
The film was shot on Agfacolor stock that was taken from Germany after the fall of Berlin.
After Joseph Stalin's death, this film was pulled from distribution during the "de-Stalination" of the USSR.
During Hitler's wedding the "Wedding March" by Felix Mendelssohn. It is very unlikely that it was played there as Mendelsohn was Jewish and was ignored during the Nazi regime. It is more likely that the Wedding march by Hitler's favorite composer Richard Wagner was played.