When Nawi's father takes her to give her to the king after she rejects her latest match for marriage, outside the gates her 2 French braids are neat but then once she is granted entry into the palace, her braids all of a sudden appear to be weeks old and puffy.
At 11:16 when Nawi is given to the Agojie her natural hair is braided tightly to her scalp. A few seconds later when she is inside the gates her braids are puffy and the hair is a different texture because it's a wig.
The Dahomey Mino (or Dahomey Amazons) did not fight to end slavery but were in fact prolific slavers themselves. The Dahomey enslaved thousands of fellow Africans until the kingdom was defeated by the French in 1894.
When negotiating the slaves, they use the word "Real" to refer to the money, the actual currency in Brazil. The correct would be "Réis".
When Santo and Malik are first seen entering the fort of Ouidah, a flag of the Empire of Brazil is seen flying atop the fort. Though it is suggested that both Santo and Malik came from Brazil, the fort of Ouidah (S. Baptista de Ajudá) was actually Portuguese and remained under the control of Portugal until 1961.
Earlier in the movie there is a scene featuring Impala, a species found only in East and South Africa, and the sound effect used for them is the sound of an North American elk bugle.
Izogie made reference to a sloth. Sloths are native to South and Central America; she should, therefore, not have known about them.
King Ghezo speaks 3 phrases that are said to be Portuguese but are not a language at all. Malik speaks with a poor mixed accent. Only Santo speaks an understandable Portuguese.