Revealing mistake: 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. (01:21:20)
Revealing mistake: After the attack on the ball game Michael Collins visits a morgue. The corpse that is lying next to him is breathing quite visibly. (01:07:20)
Revealing mistake: 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.
Revealing mistake: When Soames gets shot through a folding screen huge fireballs erupt from his body when the bullets hit him. (01:03:30)
Revealing mistake: In the first scene, when the IRA fighters in the burning building surrender, the absolutely smoke-free fires in the windows look like cosy, gas-fuelled fireplaces. (00:03:50)
Revealing mistake: There's one head of police who, during his short stint in Dublin, pledges to introduce 'Belfast efficiency'. Shortly after that he is killed by a car bomb. However, when the bomb goes off there's a split-second shot where the car is empty although three men had just gotten in, and the driver who was starting the car is a rather crude dummy. (00:46:05)
