Analysis of information sources in references of the Wikipedia article "1971 All-Ireland Senior Football Championship final" in English language version.
Then came the three in a row team who in 1964 beat Kerry by 0 – 15 to 0 – 10; in 1965 it was Galway 0 – 12 to Kerry 0 – 9, and in 1966 Galway 1 – 10 to Meath's 0 – 7. Offaly beat us in 1971 by 1 – 14 to 2 – 8, and in 1973, Cork beat us by 3 – 17 to 2 – 13.
Another issue touched on by John O'Keeffe in his interview was the strange decision to extend senior championship provincial finals, All-Ireland semi-finals and finals to 80 minutes – which was an extra third on the previous duration of an hour. Curiously, it made little difference to the outcome of matches. Of the five finals plus 1972 replay played over 80 minutes – the length of a match was settled at 70 minutes from 1975 onwards – only the 1971 Offaly-Galway result would have been affected. Had it been played over an hour, it would have ended in a draw instead of Offaly's first All-Ireland triumph.
