I mentioned Lincoln the other day and got one big thing wrong. Tommy Lee Jones plays Thaddeus Stevens, not Steven A. Douglas. Please, calm your seething - it could have happened to anybody who has an inflated idea of their command of American history, as I do.
However - something serious that the filmmakers got wrong is that they show Connecticut voting against the Emancipation Proclamation. Connecticut have apparently demanded this be fixed before the DVD is released.
I think it would be nice if this could be done by having famous Connecticutian and rapper, 50 Cent, do a pimp roll onto the set in a really poor attempt at 1850s costume. When the speaker says "Connecticut?" 50 Cent says "You know it, Wiggy".