During the race between the two carriages, Eric Blore's hat blows off. Yet as they pull into the city he has it back on. Then it is gone again when he enters the building.
One of the songs played is the Polovstian Dance from Borodin's opera Prince Igor. Although sketches for the dances existed around 1874, the piece was never performed until 1898. Since this action takes place in 1879, this music wasn't known then.
When Strogoff is being chased on horseback from Omsk, the horse trips in an open area well within view of those chasing him. Yet just after he falls, he is suddenly in a wooded area and he is able to hide himself as his chasers just ride on past.