Fianna Fail seems on track to do a bit better than the exit suggested (Fine Gael & Labour look just about bang-on) - perhaps there was a tiny last-minute rally round them, or, as one commentator suggested earlier, they had those votes all along but people were too embarrassed to tell pollsters they would still vote for Fianna Fail.
I think this was also one explanation offered for the stronger-than-expected Tory vote in 1992.
FG seems to have done some excellent vote management which should make the rally largely moot vis-e-ve the seat predictions. But we will have to wait until tomorrow to see.