Continuity: Early in the film, Michael talks to Harry Boland on a boat. During this scene, a cigarette appears in Boland's mouth that was not in the previous shot. (Time) Submitted by Cubs Fan

Factual error: During one of the cabinet meetings, one of the members says Collins' brief is Minister for Intelligence, but he was actually Minister of Finance. He was, however, the IRA's Director Of Intelligence.

Revealing: When Liam Neeson is on the boat on his return from England there is a shot of the water and part of the boat where you can see a modern CCTV camera on the side of one of the masts - rather advanced for the time the film was set. (Time)

Factual error: The Lee Enfield rifle is chambered by singular repetitions with a bolt action. When Collins' wayward friend is shot in the water, the rifle shots are rapid semi-automatic fire.

Revealing: In two scenes - first when Harry Boland is getting on a train, and next during the game which is machine gunned by the authorities, overhead DART (Dublin Area Rapid Transit) electric train lines are visible over the railway. The film is set between 1916 and 1922, and the DART started operations in 1984.