CREATE TABLE table_30651 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

Who is the directed by when 2t6404 is the production code?
SELECT "Directed by" FROM table_30651 WHERE "Production code" = '2T6404'
SELECT "Directed by" FROM "table_30651" WHERE "Production code" = '2T6404'