TEXAS AT OHIO STATE, SEPT. 10
The play: On a second-and-nine play at the Buckeyes 24, Texas quarterback Vince Young lofted a deep pass in the direction of wide receiver Limas Sweed, who beat two defenders to it and secured the ball as he fell to his back near the side of the end zone.
After further review: Ohio State safety Nate Salley had gotten his hands on the ball as Sweed came down with it near the sideline. But the touchdown stood as originally called on the field.
Why it mattered: After the extra point, Texas took a one-point lead in the final three minutes and held on for a 25-22 victory. A Rose Bowl berth could hinge on that one play, that one call.
ARIZONA AT UTAH, SEPT. 2
The play: On Utah's second play of the game, quarterback Brian Johnson was hit as he threw the ball. Arizona's Darrell Brooks recovered the loose ball at the Utah 25.
After further review: Officials reversed the call and ruled it an incomplete pass. Utah got a third-and-12 play from its own 20.
Why it mattered: Arizona would have had prime field position to take an early lead and quiet the crowd. Instead, the two teams played a scoreless first quarter and the Utes eventually emerged a 27-24 winner.
TENNESSEE AT FLORIDA, SEPT. 17
The play: On a third-and-18 play in the second quarter, Tennessee quarterback Erik Ainge appeared to complete a pass to Bret Smith, which would have given the Volunteers a first down on the Florida 1.
After further review: Officials reversed the call, explaining that replay showed the ball had touched the ground before Smith secured it.
Why it mattered: Tennessee settled for a 37-yard field goal attempt, which was blocked by Dee Webb with 3 minutes 56 seconds remaining in the half. The Vols did not score again.
NOTRE DAME AT MICHIGAN, SEPT. 10
The plays: First, Michigan's Chad Henne was ruled down inside the Notre Dame 1. On the next series, the Irish's Brady Quinn was ruled to have fumbled the ball.
After further review: Officials overturned both calls. Henne's fumble was called a touchback after Notre Dame's Chinedum Ndukwe recovered. On Quinn's supposed fumble, Notre Dame retained possession.
Why it mattered: Either call could have changed the outcome. Notre Dame's offense stalled throughout the second half and Michigan possessed almost all the momentum after halftime. But the Irish won, 17-10.