Oh, every team has had bad calls go both ways on them. I know my Gators have. (Just ask any Tennessee fan.)
The onside kick call was one that instant replay could have (and should have?) corrected. I think the official realized now that he blew the call.
One problem may have been that the replay official may not have been able to slow down the replay to check it carefully. The Pac-10 may not have as sophisticated replay technology as other conferences. That is one issue with the instant replay system... all the major conferences use it, but some have better setups than others.