Question: What is the production code of the episode directed by David Solomon? 
SQL: SELECT "Production code" FROM "1-21304155-1" WHERE "Directed by" = 'David Solomon';

Question: Who wrote the episode with the production code of BN103? 
SQL: SELECT "Written by" FROM "1-21304155-1" WHERE "Production code" = 'BN103';

Question: What was the original air date of the episode that had 4.08 million U.S. viewers? 
SQL: SELECT "Original air date" FROM "1-21304155-1" WHERE "U.S. viewers (millions)" = '4.08';