Question: What is the original air date of the episode that had a week ranking of 21?
SQL: SELECT "Original air date" FROM "1-23177573-1" WHERE "Rank (week)" = 21.0;

Question: What was the week ranking of the episode written by Russel Friend & Garrett Lerner? 
SQL: SELECT "Rank (week)" FROM "1-23177573-1" WHERE "Written by" = 'Russel Friend & Garrett Lerner';

Question: What was the week ranking of the episode written by Thomas L. Moran and directed by Andrew Bernstein?
SQL: SELECT "Rank (week)" FROM "1-23177573-1" WHERE "Written by" = 'Thomas L. Moran' AND "Directed by" = 'Andrew Bernstein';