CREATE TABLE "table1_18424435_3" (
  "no" real,
  "num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "canadian_air_date" text,
  "u_s_air_date" text,
  "production_code" real,
  "canadian_viewers_million" text
);

Question: Who wrote the episodes watched by 1.816 million people in Canada?
SQL: SELECT "written_by" FROM "table1_18424435_3" WHERE "canadian_viewers_million"='1.816';

Question: Who wrote the episodes watched by 1.575 million people in Canada?
SQL: SELECT "written_by" FROM "table1_18424435_3" WHERE "canadian_viewers_million"='1.575';

Question: Who directed the episode aired on February 27, 2009?
SQL: SELECT "directed_by" FROM "table1_18424435_3" WHERE "u_s_air_date"='February 27, 2009';

Question: Which episodes had production code 217?
SQL: SELECT "title" FROM "table1_18424435_3" WHERE "production_code"=217;