Context: CREATE TABLE table_2818164_4 (no_in_series INTEGER, directed_by VARCHAR, original_air_date VARCHAR)
Question: What is the series number for the episode directed by  jay sandrich that aired October 23, 1986?
Answer: SELECT MIN(no_in_series) FROM table_2818164_4 WHERE directed_by = "Jay Sandrich" AND original_air_date = "October 23, 1986"