Factual error: The French Cuirassiers are all carrying lances. Cuirassiers did not carry lances - their primary weapon was the sword.
Factual error: In the dancing scene in the pub, the band playing contains a tuba. The tuba was not invented until the mid-1830s.
Factual error: At least in two different shots people are humming Johannes Brahms' lullaby. This shouldn't be possible, because Brahms didn't compose his lullaby (op49. No 4, Wiegenlied) until 1868.