Pretty Little Liars won't just flashback on tomorrow night's new episode.

It will flashback to a key date in the show's history.

As depicted below, Alison returned from a vacation on the day she went missing. But was she lying about the destination of that trip? How might that play a role in the overall mystery? Watch this clip and you'll see why we're asking such questions...

Multiple returns will also take place on "Salt Meets Wound." They're teased in this trio of sneak peeks from the hour.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.