Question: What is the series episode number of the episode with production code 303?
SQL: SELECT "No. in series" FROM "1-16581695-4" WHERE "Production code" = '303';

Question: What is the production code for episode 15 in season 3?
SQL: SELECT "Production code" FROM "1-16581695-4" WHERE "No. in season" = '15';

Question: Who directed episode 12 in season 3?
SQL: SELECT "Directed by" FROM "1-16581695-4" WHERE "No. in season" = '12';