No problem going for two... tried to get it to a 1 score game. The D played well in the 1st half with the O doing them no favors (3 and outs). Once Flynn came McCarthy likely figured he had limited chances left. He put Flynn in for the offensive spark, but it also provided a bit of a boost for the defense.
I also have no problem with the FG in OT, but I was scratching my head with the calls on the first 3 downs.