Goofs

Dil's hair changes during the first scene at the Metro.

(at around the 44:40 mark) Dil gets up from her seat and leaves Metro (to catch up to Fergus and to get away from Dave). In the very next shot, when Colin the bartender looks over his shoulder and notices Dil leaving the bar (followed closely by Dave), the mirror behind him shows Dil's reflection. She is still in her seat, smiling.

When Fergus wipes away the tears from Dil's face, some of the tear streams have disappeared.

When Dil is crying in the bar, tear streams appear at the back of her eyes. Tear ducts are at the front of the eyes, so tears would never flow from the back of the eyes.

A sub-machine gun is fired at officials entering a car. Several officials on both sides of the car are hit, but none of the cars have broken windows or other damage.

In Balbriggan County, Dublin, a Northern Ireland Railways GM locomotive 113 passes in the background, pulling a passenger train. It makes the sound of a British Rail HST railcar set, which is quite different. The sound effect is also too short; most of the train passes silently.