Castle 

Special thanks to John F. for correcting some of this information.

The DVD release of The Complete Second Season did not include any full-length audio commentaries.

 

Listing 21 commentaries.

Castle: The Complete First Season cover

Castle: The Complete First Season
4 commentaries
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Episode 1.01: “Flowers for Your Grave”
Commentators: Rob Bowman Andrew Marlowe Jon Huertas Nathan Fillion Stana Katic

Episode 1.05: “A Chill Goes Through Her Veins”
Commentators: Andrew Marlowe Rob Bowman Nathan Fillion Stana Katic Jon Huertas Molly C. Quinn

Episode 1.10: “A Death in the Family (Commentary 1)”
Commentators: Andrew Marlowe Rob Bowman Nathan Fillion Stana Katic Jon Huertas Molly C. Quinn

Episode 1.10: “A Death in the Family (Commentary 2)”
Commentators: Seamus Dever Jon Huertas

Castle: The Complete Third Season cover

Castle: The Complete Third Season
2 commentaries
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Episode 3.01: “A Deadly Affair”
Commentators: Andrew Marlowe Rob Bowman Nathan Fillion

Episode 3.06: “3XK”
Commentators: Bill Roe David Amann Seamus Dever Jon Huertas

Castle: The Complete Fourth Season cover

Castle: The Complete Fourth Season
3 commentaries
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Episode 4.01: “Rise”
Commentators: Rob Bowman Jon Huertas Seamus Dever Tamala Jones

Episode 4.10: “Cuffed”
Commentators: Andrew Marlowe Terri Miller Nathan Fillion Stana Katic

Episode 4.14: “The Blue Butterfly”
Commentators: Terence Paul Winter Luke Reichle Susan Sullivan Tamala Jones Molly C. Quinn

Castle: The Complete Fifth Season cover

Castle: The Complete Fifth Season
4 commentaries
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Episode 5.06: “The Final Frontier”
Commentators: Jonathan Frakes Nathan Fillion Luke Reichle

Episode 5.15: “Target”
Commentators: David Amann Bill Roe Susan Sullivan Molly C. Quinn

Episode 5.16: “Hunt”
Commentators: Andrew Marlowe Rob Bowman Nathan Fillion Molly C. Quinn

Episode 5.19: “The Lives of Others”
Commentators: Andrew Marlowe Terri Miller Marta Evry Robert Duncan

Castle: Season 6 cover

Castle: Season 6
4 commentaries
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Episode 6.03: “Need to Know (Character Commentary)”
Commentators: Javier Esposito Kevin Ryan

Episode 6.10: “The Good, The Bad & The Baby”
Commentators: John Terlesky Terri Miller Nathan Fillion Seamus Dever

Episode 6.12: “Deep Cover”
Commentators: Terence Paul Winter Nathan Fillion Susan Sullivan James Brolin

Episode 6.17: “In the Belly of the Beast”
Commentators: Andrew Marlowe David Amann Rob Bowman

Castle: Season 7 cover

Castle: Season 7
2 commentaries
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Episode 7.01: “Driven”
Commentators: Rob Bowman Jon Huertas Seamus Dever David Amann

Episode 7.15: “Reckoning”
Commentators: Nathan Fillion Michael Mosley Rob Bowman Andrew Marlowe

Castle: Season 8  cover

Castle: Season 8
2 commentaries
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Episode 8.06: “Cool Boys”
Commentators: Nathan Fillion Adam Baldwin

Episode 8.16: “Heartbreaker”
Commentators: Jon Huertas Seamus Dever Barry O'Brien

Involving 24 commentators.