CREATE TABLE table_22423 ("No. in series" TEXT, "Title" TEXT, "Directed By" TEXT, "Written By" TEXT, "air date" TEXT, "Production code" TEXT)

When 1008/1009 is the production code how many directors are there?
SELECT COUNT("Directed By") FROM table_22423 WHERE "Production code" = '1008/1009'
SELECT COUNT("Directed By") FROM "table_22423" WHERE "Production code" = '1008/1009'