Sectarian rivalries between Protestants and Catholics were common in the West of Scotland throughout the 1950s.
An increase in numbers of Irish Catholic immigrants coupled with state funding of Catholic schools after the war led to increased tensions.
This theme is touched upon throughout the play. Phil and Spanky are Catholics. Hector, Jack, and Mr. Curry are Protestants.
While Byrne takes no real stance on this issue, religious divides play a part in the humour and attitudes of the characters.