Continuity mistake: When Toby/Kunta encounters the British army captain (after strangling the overseer) most of his whipping scars are centered down his middle back, with a few marks on his shoulders. When in the prior episode, the whip struck mostly his lower left backside.
Factual error: At the picnic, a woman says she is going to New York by train. It is 1828. Railway passenger service in the United States did not begin until 1830 and it would not be possible to travel from North Carolina to New York until some years after that.