As has been mentioned, he took off a forward and put on Andreu. Took off Wallace, who was later given MOM, and who puts a decent ball in.
Most bizarrely of all, he left McGrath on for the full game. I don't know if he's playing out of position, but was totally invisible the whole game. Is it because he's one of his signings, he has to play ? Was expecting decent things after the Dundalk fans meltdown that he was too good for shitey St.Mirren, but unless he improves, they can have him back.