https://www.rugbyleagueproject.org/competitions/wills-cup-1974/game-3/manly-warringah-sea-eagles-vs-canterbury-bankstown/summary.html
You have listed Mick Brannaghan as the referee for this game. It looks like Mr. Brannaghan refereed games between 1926-28, so it would assume that this is an error. Laurie Bruyeres was listed as the referee in the lead up to the game.
Daily Mirror team lists for the game from 6-3-1974 attached.
Good pickup seems like a slip of the mouse but Laurie Bruyeres was definitely the referee it's now fixed.