The dossier scene is taken from Memory (1966). Thus, even though neither take part in the mission, we see Cinnamon and Barney's dossiers in the pile before Briggs selects first Willie and then Rollin for the mission. As Briggs folds up the dossier case, we also see Joseph Baresh's dossier on the top of the pile.
Apparently the trial sequences were shot on the Perry Mason court set, marking the second time it appeared in colour.