I don't mind how the movie diverges from the actual story as its primary purpose is entertainment but I found the movie's script let things down enormously. I found the script was extremely blatant and was very cliché. Fortunately the strength of the story (the story, not the script), the acting and the directing make the movie enjoyable enough. If only this movie had a better writer then the story could have made a much bigger impact.
ERRATA: ccthemovieman-1 writes in his review, "The story is based a true situation in the mid 1950s Ireland in which, in the end, the Irish Constitution was amended because of this case." Neither in the movie nor in the real events from which the movie is based was the Irish Constitution amended. SPOILER: In both, Desmond Doyle's victory is achieved by challenging the constitutional validity of the law which was used to refuse Desmond custody of his children. The supreme court held that the statute conflicts with the constitution and is therefore invalid (hence that law could no longer be used to deprive Desmond of custody).
ERRATA: ccthemovieman-1 writes in his review, "The story is based a true situation in the mid 1950s Ireland in which, in the end, the Irish Constitution was amended because of this case." Neither in the movie nor in the real events from which the movie is based was the Irish Constitution amended. SPOILER: In both, Desmond Doyle's victory is achieved by challenging the constitutional validity of the law which was used to refuse Desmond custody of his children. The supreme court held that the statute conflicts with the constitution and is therefore invalid (hence that law could no longer be used to deprive Desmond of custody).