CREATE TABLE table_21633 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB)

In which season did Paul McCrane first direct an episode?
SELECT MIN("Season #") FROM table_21633 WHERE "Directed by" = 'Paul McCrane'
SELECT MIN("Season #") FROM "table_21633" WHERE "Directed by" = 'Paul McCrane'