Makes sense as there is a glow buzz file on the disc. Now to theorize how it gets unlocked...
As for seeing what sheriff posted about, oddly enough, yesterday my son and I both witnessed the same ring of characters. He was playing as Vanellope in the hall of heroes and all of a sudden the screen went into showing the ring of characters but it was so quick I couldn't make out Mickey and agent p like in his photo. So I played as her glitching all over and I had it happen to me to the left of the Lone Ranger statue walking into the hoh from the outside to the inside. I tried and tried again for it to happen but couldn't get it to do it.