CREATE TABLE table_28258 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Director" TEXT, "Writer ( s ) " TEXT, "Original air date" TEXT, "Prod. code" FLOAT, "U.S. viewers  ( million ) " TEXT)

Who directed the episode with production code 227451?
SELECT "Director" FROM table_28258 WHERE "Prod. code" = '227451'
SELECT "Director" FROM "table_28258" WHERE "Prod. code" = '227451'