Hi! There's always room for more input on this film, but meanwhile, there has been a bunch of previous posts, so check them out for previous responses:
How accurate is the film adaptation of 12 Years a Slave?
How accurate was the portrayal of slave life in the movie "12 Years a Slave"?
How historically accurate is "12 Years a Slave"?
What was the average treatment of a slave in mid 1800's America?
How often were freemen kidnapped in the north and sold into slavery?
Was there any abolitionist movement in the antebellum U.S. South?