In the early 1930s controversy raged between the British AAA and the National Athletic and Cycling Association of Ireland (NACAI). The British AAA claimed jurisdiction in Northern Ireland while the NACAI claimed jurisdiction over the entire island of Ireland regardless of political division. The controversy came to a head in the lead-up to the 1936 Summer Olympics when the IAAF finally disqualified the NACAI. O’Callaghan remained loyal to the NACAI, a decision which effectively brought an end to his international athletic career. No Irish team travelled to the 1936 Olympic Games, however O’Callaghan travelled to Berlin as a private spectator. After Berlin, O’Callaghan's international career was over. He declined to join the new Irish Amateur Athletics Union (IAAU) or subsequent IOC recognised Amateur Athletics Union of Eire (AAUE) and continued to compete under NACAI rules. At Fermoy in 1937 he threw 195’ 4” – more than seven feet ahead of the world record set by his old friend Paddy 'Chicken' Ryan in 1913. This record, however, was not ratified by the AAUE or the IAAF.