Such physical punishments in the army during and after the Napoleon wars were not proceeded, since they were cancelled by the order of commander Yakov Potemkin- They were only introduced in 1820 by commander Schwartz.
The pogrom of the Semenov corp in 820 did no happened as the bound was made to army will raise and they wanted remain until the reforms of Offier Schwarz are not changed. Complaints were only made as a report, not as a revolt.
In real life the decembrists came up with the idea or their revolution by the Spanish Revolution by Rafael del Riego y Núñez. IN the movie it is shown as an original idea.
When Czar Alexander I was informed that the decembrists are trying to kill him he causally informed his advisor to ignore it. This didn't happen. Instead the army of general Alexandr Chernyshev to arrest the plotters.
The Winter palace in St. Petersburg had a different color in the early 19th century. Unlike having the emerald tone as it has been since 1918 it was yellow until the burning in 1837 and when it became red and later pink.
When the fighters come out of the General Staff Building the Isaak cathedral is seen in building process. The dome is seen half finished. The scene is set in 1825. The shown status appeared in the early 1830s.
The Semenov corp is portrayed as a rude crowd. In real life it was a elite corp.