Not the point, but your statement is telling. LSU is "supposed" to be a top defensive team and your feelings are hurt because you lost those bragging rights. Repeat after me: "Undefeated, 3rd ranked".
Looks like USC pretty much gave up yardage throughout the entire game. The 3rd quarter was when usc scored on 4 consecutive drives of 6,2,4,5 plays. Drive Summary for the USC - 'Sisters of the perpetual Surf': Yardage USC gave up by quarter 1st: 110 2nd: 60 3rd: 149 4th: 115 Yardage LSU gave up by quarter 1st: 33 2nd: 160 3rd: 164 4th: 229