A Southern planter is shown hanging his screaming Northern wife from a tree in broad daylight after learning she was a Union spy. A group of Confederate soldiers look on indifferently. The Southern code of chivalry would likely have led the soldiers, especially the officers, to intervene, especially since they had no way of knowing whether the young woman was guilty or not. for all the soldiers knew, the husband was insane. Moreover, neither side in the Civil War would hang women as spies.
Chicken George is taken to England as a slave in the 1840's and is held as a slave there until given his freedom in the late 1850's. Great Britain abolished slavery throughout its empire in 1833. Chicken George would have been a free man the second he set foot on a British ship or on British soil.
Kunta's father extols Alla ahu Akbar on the night Kunta was born. The Mandinka were not converted to Islam for about 100 years after the birth of Kunta Kinte.
When Kunta Kinte is on the ship heading for America in 1767, the flag used has the red diagonals in the Union Jack. These were not added until the Act of Union with Ireland in 1801.
Spanish moss is shown hanging from trees on a plantation in Spotsylvania, VA, which is only about 60 miles south of Washington DC. This vegetation is normally seen no further north than southern South Carolina, which is quite a bit further south.