How come the 5-day Return column in the table doesn't match the 5-day chart?

Return values in the Table are calculated from the daily closing prices. The 1-day, 2-day, and 5-day charts, however, start with the 9:30 AM opening price and that can be different. While each of these behaviors is consistent with other financial sites, the result is that on the weekend a 5-day chart show changes from 9:30 AM Monday through 4:00 PM Friday whereas the 5-day return column shows the dividend adjusted change between the closing price of each Friday.

Why do 5-year returns for... Is option pricing available?