My dad is 86, and he can't find the game. BTN has some other game on. For me, on DirecTV it seems to be 610.1... but he doesn't have DirecTV, so I can't help him.
It'll be on Channel 24 in Lincoln at 5pm this evening. TimeWarner just hasn't updated their TV Guide thing. That's the kind of service you get for these low, low prices.
As long as he's on the main BTN channel, it should get the Nebraska game. If you have any other trouble, BTN has a game finder where you input the tv provider and your zip code and it tells you what channels the games will be on.
If you check that and you check the guide, and it's still not saying the Nebraska game on the right station, then like BOJ and Knapplc said, the guide probably needs updating.