Board Thread:General Discussion/@comment-24589671-20140824004934/@comment-24674051-20141030154542

Rumple said it best himself. Memory issues are a far too common ailment in storybrooke.

Gold and Regina both have the power to manipulate memories, and also concoct amnesia potions (We have seen both of them do this). The Snow Queen's power, though based in Ice, seems to be on par with Regina, Emma, and Elsa, so she could have her own way of erasing or modifying memories.

As for False memories of the Snow Queen, the thing is Emma has NO memory of the Snow Queen, either from he teen years, or from Season 1. technically, you could call that a false memory, though I would classify a blocked or erased memory differently than a fake memory.