CREATE TABLE table_1491 ("No. in series" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original airdate" TEXT, "Production code" TEXT)

What is the number in series for the episode titled 'Kevin's Big Score'?
SELECT "No. in series" FROM table_1491 WHERE "Title" = 'Kevin''s Big Score'
SELECT "No. in series" FROM "table_1491" WHERE "Title" = 'Kevin\'s Big Score'