The theatre is obviously on the Protestant side of the bridge. Catholic bullies will not cross the bridge at the beginning of the film, but are routinely seen at the theatre. They even tell the Protestant at the theatre to go back to his own side of the bridge, implying that it is on the Catholic side.
The 'Chopper' bike that features does not have a 'gear stick' in the center of the frame meaning that is one of the Mk3 chopper bikes released in 2004, not an original one in keeping with the time period of the movie.
The train that passes under the Tate's Avenue bridge at the start of the film (in the impressive aerial shot) is of a type not introduced on the Northern Ireland Railways network until 1974. It is also sporting a recent colour scheme which places it at the start of the current century.