There is inconsistency on the BYUtv/BYUtvSports staff on where they'll post/provide access to games. I had to go to the DVR &/or Game Day portions of their site to get some of these - Virginia is already in the Football section of BYUtv but Houston is not...very disorganized...
That said - you can apparently watch some replays of the Texas game apparently on ESPN or LHN channels but they do not provide access to any video on demand. Note that their next broadcast of the BYU @ Texas game is tonight at 9:00 PM ET http://espn.go.com/watchespn/#channel/longhorn/sport/football/type/upcoming/
I get they are fighting (see below) to get distribution and so restricting availability of games they own makes sense...but I do not understand why BYUtv doesn't have any pre/post game shows that they produced available for that game...