CREATE TABLE "table1_27913766_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_millions" text
);

Question: who wrote the episode "he ain't heavy"?
SQL: SELECT "written_by" FROM "table1_27913766_1" WHERE "title"='\"He Ain''t Heavy\"';

Question: how many times was the episode "the old maid of honor" originally aired?
SQL: SELECT COUNT("original_air_date") FROM "table1_27913766_1" WHERE "title"='\"The Old Maid of Honor\"';

Question: the episode "a change in heart/pants" had a maximum of what number in the series?
SQL: SELECT MAX("series_num") FROM "table1_27913766_1" WHERE "title"='\"A Change in Heart/Pants\"';