Substitutes
When one of the Allied players breakes his leg or something he was subsituted. As far as I know subsitutions weren't allowed until 1970(?).
It would have been a far better movie if Mr. Stallone hadn't been in it, or if he and the director and writing team had at least seen a football match (I hate the word soccer). If they have ever seen a match, then they can not have paid too much attention to what happened on the pitch.