CREATE TABLE "table1_27155243_3" (
  "total_num" real,
  "episode_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);

Question: How many different episode numbers does the episode written by Sheri Elwood and directed by Jim Allodi have?
SQL: SELECT COUNT("total_num") FROM "table1_27155243_3" WHERE "written_by"='Sheri Elwood' AND "directed_by"='Jim Allodi';

Question: How many different episode numbers are there for the episodes directed by Sheri Elwood?
SQL: SELECT COUNT("total_num") FROM "table1_27155243_3" WHERE "directed_by"='Sheri Elwood';