sentences:  NSWRFL teams also competed for the 1975 Amco Cup.The season saw the introduction of differential penalties for scrum offences.Each side faced each other twice in twenty-two regular season rounds from March to August, resulting in a top five of Eastern Suburbs, Manly-Warringah, St. George, Canterbury-Bankstown and Parramatta who battled it out for the premiership over six finals matches.