Continuity mistake: During the match, when funny music is playing, the guards attack the Mean Machine team. Monk has left empty the area (this is not the part when they do the goal), and you can see that there's nobody in the Monk's area. Change of shot, and suddenly there's a person of the Mean Machine team. Change of shot (when the ball almost enters) and there's nobody again in the area.
Factual error: On his arrival at Longmarsh Prison, Danny Meehan is told that the establishment is a 'Cat B' prison. However, earlier in the plot, we learn that Danny Meehan is to be sent to a 'high security' prison. Cat B prisons are not high security prisons. They are known as 'local' or 'training' prisons. 'Dispersal' or 'Cat A' prisons form part of the high security estate.
Trivia: At the end of the movie the match commentator gives the following speech: "Guards of Pentonville, guards of Wandsworth, Walton nick in Liverpool, policemen of Britain, traffic wardens and parole officers, wheel clampers, your boys have taken a hell of a beating today. A hell of a beating." This speech is a direct reference to Norwegian sports commentator Bjørge Lillelien who made British headlines, when Norway in 1981 beat England out of the world cup qualifier.
Massive: If you want any of life's little luxuries - chocolate, toothpaste, soft toilet paper - Massive is your man.
Danny Meehan: Massive?
Massive: It's ironic.
Danny Meehan: I'll tell you something, I didn't start off out as a youngster looking to sell my country out.
Massive: None of us planned to be here, mate.
Chiv: But you're forgetting one thing. You're a hero in Scotland.