Factual error: At the end of the film, Ali is sent to the British Embassy in Jamaica. As Jamaica is a member of the Commonwealth, the plaque should say "British High Commission", not "British Embassy". (01:15:35)
Factual error: When Ali goes to see the Queen for the first time the voice over says "Her Majesty the Queen," while showing the outside of Buckingham Palace which implies that the next shot is of them inside. There is one problem here, the Queen's Royal Standard is not on the top of the Palace which it should be if she is there.
Factual error: The set of the House of Commons used has only 4 rows of seating. The actual House has 5 rows.
Factual error: The first newscast about the African incident displays Burkina Faso as "Burkina" on the map. This shortened name is not used for this country (AFAIK).
Suggested correction: It says Burkina Faso but it's cuts it off because of the angle at which the camera is filming.
Factual error: When Ali is chained to the fence and the journalists are eating chicken at him, they have a KFC box and mention "Chicken Dippas" but the product they are eating has never been made by KFC.