One of the people that is documented in the series is Michael Romanoff who owned a successful restaurant in California. People believed he was a Romanov, but he was really a con man and had no connection to the family.
In several episodes various people say that "they" killed little girls. While the Bolsheviks did kill Czar Nicholas II and his children they were not girls. His oldest daughter was almost 22 and his youngest child a son was 14.