It's not a part of Schedule D, it's a separate worksheet. If you look at the 1040 in your return, you'll see Qualified Dividends on 9B and Ordinary Dividends on 9a. Ordinary dividends are added into your AGI, and, like all changes in AGI, many changes can occur in your return as a result.
Your income can be taxed at a higher rate, you can lose some or all of certain credits or deductions, and anything related to AGI limits can change, such as eligibility for IRA contribution amounts, medical deductions, etc.
The only way to see what changes is to look at or print your return or 1040 before and after the dividend entry. To see your 1040, click on Tax Tools on the left, then Tools, Choose View my Tax Summary, then Preview my 1040. You'll see the 1040 and all 6 of the attached Schedules.
