Board Thread:False Info and Speculative Discussion/@comment-13965604-20150729013325/@comment-13895380-20150729033356

I think all of the memories will be relevant...or else they are just pointless in regards to what Valack told them.

Lydia's grandmother had trepenation done on her, which is relevant to Valack and what he wants to do to Lydia (first episode), so I'm sure that has something to do with the plot. I hope the others did too. The Dread Doctors were in Beacon Hills before, but we don't know when. Given that Lydia, Stiles and Scott were all young in their flashbacks, maybe they saw them the first time they were in Beacon Hills, and didn't know about it?