Though highly regarded in terms of its narrative form and structure, the film received wide-spread criticism from historians for its many historical inaccuracies and fictions.
Fictional aspects that proved controversial include:
Neil Jordan defended his film by saying that it could not provide an entirely accurate account of events, given that it was a two-hour film that had to be understandable to a world-wide audience who would not know the minutić of Irish history in 1916 - 1922. His critics however alleged that the scale of the fiction introduced, the use of real names for 'composite characters' who like Broy did not die as suggested, and in particular the misrepresentation of de Valera, the manner of Collins' death and the introduction of the provocative assassination of a car-load of Northern Irish unionists who in reality never existed let alone were killed in that manner, seriously undermined the film's trustworthiness.
A statement in the film that the Irish Free State was formed at the start of 1922, following the Dáil's approval of the Treaty, has since appeared as fact on various websites, even though the Irish Free State did not come into being until December 1922.The Film's Inaccuracies and Fictions
Jordan's Defence