The OC 

Note: The DVD release of The Complete Third Season did not include any episode-length audio commentaries.

 

Listing 4 commentaries.

The O.C. - The Complete First Season cover

The O.C. - The Complete First Season
1 commentary
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Episode 1.01: “Pilot”
Commentators: Josh Schwartz Stephanie Savage

The O.C. - The Complete Second Season cover

The O.C. - The Complete Second Season
2 commentaries
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Episode 2.06: “The Chrismukkah That Almost Wasn't”
Commentators: Josh Schwartz Bob DeLaurentis

Episode 2.14: “The Rainy Day Women”
Commentators: Josh Schwartz Stephanie Savage Alexandra Patsavas Matt Ramsey

The O.C. - The Complete Fourth Season cover

The O.C. - The Complete Fourth Season
1 commentary
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rent @ netflix »

Episode 4.16: “The End's Not Near, It's Here”
Commentator: Josh Schwartz

Involving 5 commentators.