CREATE TABLE table_26402 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" FLOAT)

How many people directed 'through the looking glass'?
SELECT COUNT("Directed by") FROM table_26402 WHERE "Title" = 'Through The Looking Glass'
SELECT COUNT("Directed by") FROM "table_26402" WHERE "Title" = 'Through The Looking Glass'