From the Mailonline about the third goal...
Television replays were later accompanied by a claim that McDonald was poised to award Aberdeen a penalty before giving the goal. An alternative version has it that the referee saw his assistant Willie Dishington’s flag and blew for a Celtic free-kick when, in fact, the linesman was signalling a legitimate goal.
Either way, the goal was allowed to stand, to the consternation of the away dugout. ‘We had a look at it and there is certainly not a penalty there,’ added Strachan.
So you can't see Hesselink pulling back Mackie by the neck of his shirt?
Such a bad loser.