Board Thread:Manga/@comment-5774380-20170106232308/@comment-30977278-20170108034946

I think like the mentions of Mikasa and Armin weren't any forms of time travel, instead, like some of you have said, just Eren accessing and changing his father's memories unintentionally but not permanently. Eren Kruger even asks "Who is the owner of this memory" in response to Grisha asking who Mikasa and Armin were. This could also be one of the false previews that Isayama does.