CREATE TABLE table_28420 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( million ) " TEXT, "Rank  ( week ) " TEXT, "Original air date" TEXT, "Production code" TEXT)

What was the title of the episode directed by David Mamet?
SELECT "Title" FROM table_28420 WHERE "Directed by" = 'David Mamet'
SELECT "Title" FROM "table_28420" WHERE "Directed by" = 'David Mamet'