Reference the disallowed Spurs goal from a penalty at half time, this game was one of the last of the 1959/60 season (16/4/60) and Spurs lost 0-1 to a late City goal. At the end of the season, Spurs lost the Div 1 title by 2 points when 2 points were awarded for a win, and Spurs' goal average and difference were a lot better than the eventual title winners, Burnley. So in a sense, Mr Pullin's decision to disallow the goal was crucial in deciding the title destination that season. As you say, we are unlikely to see a similar situation now on the PL, with time being added on for stoppages even in added time, and I can't imagine Mr Pullin was welcomed with open arms at WHL for the remainder of his FL career.
All other things being equal, they'd have still lost the title, but by just one point !