JJ says the priest was invited to say mass at the Washington National Cathedral. It is an Episcopal cathedral. The Catholic cathedral is The Basilica of the National Shrine of the Immaculate Concepcion.
In the beginning, when Emily Prentiss' pulls up outside the bar, the red neon letters B A R are reflected in the car's side window. However the reflected letters should be mirrored.
Father Silvano tells Prentiss in Italian, "Digli di guardare nel cassetto," which means "Tell him to look in the drawer," not "look in the nightstand drawer" as it says in the subtitles.