As far as spacing, you can go back to References / Table of Contents (drop down) / choose Insert Table of Contents / on the Table of Contents dialog box that pops up, choose Modify / then highlight the specific level that you have incorrect spacing appearing on and choose Modify again / then go to Paragraph / and modify Spacing Before, Spacing After, or Line Spacing. When you go back to your ToC, the spacing problem should be resolved.

W/regard to the columns, block the Table of Contents / go to the Page Layout tab / Choose the Columns drop down (within the Page Setup area) and choose two columns)

Hope this helps.