Question: who are the directors of the episode that had 20.5 millions of north american viewers? 
SQL: SELECT "Directed by" FROM "1-27714573-1" WHERE "U.S. viewers (millions)" = '20.5';

Question: how many millions of north american viewers had the episode whose director was Michael Lembeck? 
SQL: SELECT "U.S. viewers (millions)" FROM "1-27714573-1" WHERE "Directed by" = 'Michael Lembeck';

Question: who are the writers of the episode whose production code(s) is 225560? 
SQL: SELECT "Written by" FROM "1-27714573-1" WHERE "Production code(s)" = 225560.0;

Question: who are the writers of the episode called "The One on the Last Night"?
SQL: SELECT "Written by" FROM "1-27714573-1" WHERE "Title" = '"The One on the Last Night"';