Trivia: The prison scenes were filmed inside a real prison. The warden of the prison agreed to the use of the prison for the movie if 1/3 of the money was used to improve the prison. Richard Pryor talks about his experiences behind the scenes on his Here And Now DVD.
Trivia: In the huge scene with the big rigs and all, the police car crashes off of the car trailer truck. But this stunt was really a world record for the longest car stunt that was powered by the car's own engine. The distance was well over 100 feet.
Trivia: A sequel to The Long Good Friday was written by screenwriter Barry Keeffe. Entitled The Black Easter Monday, the action starts immediately after that of The Long Good Friday when the car carrying Shand is stopped by police. Both Shand and the IRA gunman (played by Pierce Brosnan in one of his first film roles) bluff their way out of it and walk away, allowing Shand to escape. The screenplay was universally acclaimed but by the time it got through development hell Brosnan, Bob Hoskins and Helen Mirren had all become big stars. They could not commit to the project and their salary demands could not be accommodated anyway. The film was never made.
Trivia: This film's ending mirrors that of "Carrie," another film that this movie's director, Brian De Palma, made; at the end of "Carrie," Susan Snell has a dream of visiting the wreckage of Carrie White's house. Then Carrie's hand pops out of the ground and grabs Sue's arm. Susan wakes up screaming and is comforted by her mother. This film ends with Liz having a nightmare about Robert escaping from the institution, coming to her home and killing her. Liz wakes up screaming and is comforted by Peter.