User blog comment:Super side swiper/Shocking isn't it/@comment-5268982-20131026103932

Almost too many to count.
 * Lucy casting Urano Metria
 * Siegrain and Jellal being the same person.
 * Mystogan's face being that of Jellal.
 * Cana's Fairy Glitter fail when she first used it.
 * Lucy's Urano Metria fail and defeat agianst Flare.
 * Acnologia destroying Tenrou Island.
 * The teenage boy at the beginning of the Tenrou arc being Zeref, and knowing Natsu.
 * Cana being Gildarts' daughter.
 * Gray being shot and "killed".
 * Minerva's torture of Lucy.
 * Erza challenging all 100 monsters on Pandemonium.

Those are the ones that mainly come to my mind.