Accuracy is paramount in every detail of a work of history. Here's my rule: Ask yourself 'Did this thing happen?' If the answer is yes then it's historical. Then ask 'Did this thing happen precisely this way?' If the answer is yes then it's history if the answer is no not precisely this way then it's historical drama.
Revolutions are the periods of history when individuals count most.
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The general consensus among historians among the ones who can handle the fact that 'Lincoln' is in fact historical fiction is that we demonstrate enormous fidelity to history and that beyond that we've actually contributed a line of thinking about Lincoln's presidency that's somewhat original.