I'm still not sure what the documentary is really going to focus on but I'm very interested in the mentions of colonialism and the Commonwealth.
I think historians - proper historians - will be picking over any references to the history of the Commonwealth and the British Empire. I hope someone on the research side of things has at least read William Dalrymple's book on the East India Company and researched the involvement in the slave trade of aristocratic families like the Spencers.
Can of worms springs to mind. The money Diana left Harry was in large part from her her royal divorce, but some of it was actual Spencer money.
And now he's selling access to his marriage.