Factual error: Jan Christiaan Smuts is referred to as the Prime Minister of the Union of South Africa in this film when Gandhi is there. Smuts didn't gain the office until 1919, after the death of Prime Minister Louis Botha. Gandhi left South Africa in 1914 and never returned.
Factual error: Many palace scenes in the mini-series are set in the Forbidden City. This is incorrect, as the Forbidden City was built under the Ming Dynasty (1368-1644) and not completed until about 1420, almost 100 years after Marco Polo's death.