Gabriel Byrne had purchased the rights to Gerry Conlon's book "Proved Innocent" and had intended to play Gerry himself but decided to let Daniel Day-Lewis play the part and just serve as executive producer instead.
Gareth Peirce, a solicitor, is seen addressing the court. At the time of the trial, solicitors did not have "rights of audience" and could not, therefore, address the court. At that time, only barristers could do this.