Though the episode deals with the Roman Catholic faith, while discussing the background of Fr. Silvano, JJ tells Rossi,"He was even invited to say Mass at the Washington National Cathedral." The Washington National Cathedral is the popular name of The Cathedral Church of Saint Peter and Saint Paul, seat of both the Presiding Bishop of the Episcopal Church and the Bishop of the Diocese of Washington. The
Cathedral of St. Matthew the Apostle is the seat of the Roman Catholic Archbishop of Washington. Oops! Wrong religion!