Dean Baquet, the executive editor of The Times, discusses where “Caliphate” failed to meet Times standards. And Mark Mazzetti, an investigative correspondent for The Times, details new reporting that casts significant doubt on the claims of a central figure in the series.

Editors' Note: The Times has published an Editors’ Note concluding that episodes featuring a central character in “Caliphate” did not meet our standards for accuracy. Read the full statement.