UCLA was one of the best teams in the nation early on. They had a good chance to win the Pac-12 even into the mid-season but they didn't play as well in the last 25% of the season. This has to be a letdown and then they HAVE to play a team that is 5-7 and a joke of a team. It is embarrassing for them.
So the mental state of UCLA could definitely be one of "We don't really care. It's just time to end this season and move on to the next." It would be similar to our feelings when we killed Washington a few years ago and then had to play them again in the bowl and we got killed.
I look to Nebraska to win this in a minor upset: