I was under the impression that the white cans got "canned" because people were picking them up thinking they were Diet Coke when they weren't. The red cans are part of the campaign, too.
That happened to me!
Wifey drinks the Diet (no; it AIN'T working) and I the regular.
I accidently gave her one of mine to take to work.
She was NOT happy - said it tasted like battery acid. (She got that from me when I sip HER stuff!)
I hadn't realized how close the labels were, as Coke® is ALWAYS doing something to their cans.