Revealing mistake: When Karen is searching the net, she is on "www.tdn_japan.con" [sic]. This address wouldn't work... Also the Google bar spells "Imaegs" not "Images." (00:59:30)
Continuity mistake: When Yoko opens the door and ventures into the attic, the slide-door she pushes is nearly fully open. Yet when we see the shot of Yoko's legs dangling, the door is now much further shut. (00:06:20 - 00:07:35)
Answer: I don't think she actually went back into the past, I think it was just the house showing her what happened, or at least a type of visual echo of what happened. After all, some pretty strange stuff was happening in that house.
Mad Ade