For the sake of giving a few teams a smidge of credit, I'll call potential playoff teams those in the Top 15 of the final regular season AP Poll to include teams on the "bubble".
Record Against Potential Playoff Teams
Ohio State: 1-0 (Beat Texas) with B1G CG against Indiana remaining
Indiana: 1-0 (Beat Oregon) with B1G CG against Ohio State remaining
Georgia: 2-1 (Beat Ole Miss, Texas | Lost to Alabama) with SEC CG against Alabama remaining
Oregon: 0-1 (Lost to Indiana)
Texas Tech: 2-0 (Beat Utah, BYU) with Big 12 CG against BYU remaining
Ole Miss: 1-1 (Beat Oklahoma | Lost to Georgia)
Texas A&M: 1-1 (Beat Notre Dame | Lost to Texas)
Oklahoma: 1-2 (Beat Alabama | Lost to Ole Miss, Texas)
Notre Dame: 0-2 (Lost to Texas A&M, Miami)
Alabama: 2-1 (Beat Georgia, Vanderbilt | Lost to Oklahoma) with SEC CG against Georgia remaining
BYU: 1-1 (Beat Utah | Lost to Texas Tech) with Big 12 CG remaining against Texas Tech
Miami: 1-0 (Beat Notre Dame)
Vanderbilt: 0-2 (Lost to Alabama, Texas)
Texas: 3-2 (Beat Oklahoma, Vanderbilt, Texas A&M | Lost to Ohio State, Georgia)
Utah: 0-2 (Lost to Texas Tech, BYU)
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Interesting Notes prior to Conference Championship Games
7 potential playoff teams have a winning record against this group of competition: Ohio State, Indiana, Georgia, Texas Tech, Alabama, Miami, Texas
4 potential playoff teams don't have a win against this group of competition: Oregon, Notre Dame, Vanderbilt, Utah
4 potential playoff teams have 2 wins against this group of competition: Georgia, Texas Tech, Alabama, Texas
1 potential playoff team has 3 wins against this group of competition: Texas
After the Conference Championship Games, only 4 teams have the ability to have 3 wins against this group of competition: Georgia, Texas Tech, Alabama, Texas