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.
The knowledge of God is the cause of things. For the knowledge of God is to all creatures what the knowledge of the artificer is to things made by his art.
Errors are not in the art but in the artificers.