Well you said "doors blown off in the first half" and the second Notre Dame touchdown you refer to was in the second half. I'd add that is largely irrelevant anyway because it was a kickoff return touchdown which, like I said about the Texas one, is fluky. That's not one team outplaying another or coming out flat or being rusty. It's a fluky play. Georgia-Notre Dame was 6-3 with 30 seconds left and if Kirby Smart just kneels on the ball like he probably should have, that's the halftime score. So it's way more disingenuous to say Notre Dame blew the doors off Georgia in the first half. That's just flat out wrong.
As for Boise, again, were they flat or were they just not that good? They're 31st in Sagarin and 27th in Massey. Yes that comes after getting hammered by Penn State, but I doubt that one loss caused them to drop that much.
I mean, if you just want to look at the line score which shows halftime leads of 26, 14, 10 and 10 and use that to form your opinions while ignoring how the first half of the latter three games actually played out, well you do you.