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Heres what we learned from their conversation, moderated by Buzzfeeds Jarett Wieselman.
So much happens in each episode, Blackburn told EW before the panel.

Credit: David Livingston/Getty Images
Theres obviouslythereveal, the main reveal, which is so crazy; its so good.
But also just where the relationships end up thats another thing that fans are really going to love.
Kind of just how strong this group has to stay throughout these last 10 episodes.
Youre going to find out who killed Jessica DiLaurentis, who A.D. is all of the answers.
We were all crying, Parrish told EW.
Most of us were just, mouth agape, Parker said.
Blackburn was stoked, and Mitchell was blown away but Harding was not immediately sold.
I read it and I was like, I dont buy this, he admitted to EW.
It was until we had shot and wrapped…
The crowd responded very much in the affirmative.
Mitchell was Kings second choice to play EmilySpeaking of Emison, half of the ship was almost completely different.
I was leaning towards [another] actress.
But Shay just nailed it in her final audition, and nabbed the role.
Weve been waiting so long.
I do feel like Haleb was meant to be, Blackburn said.
Spaleb was fun to dabble with; Haleb is where its at.
That was a really good scene.
It was not romantic, Benson recalled but they did their best.
We had a whole playlist playing.
[Blackburn] picked out the songs, she said.
Without hurdles, the prize isnt worth anything, Dougherty added.
So many fans simply say, Why cant they just be happy?
And who wants to see that?
We have to have some struggle here.
You have to earn your happy ending.
And his dream scenario for the Liars return?
Its the show that everybody wanted but couldnt have.
Thats what I want.
I want there to be bloody murder all over the place.
Just, like, nip it in the bud a little faster, he suggested.
Pretty Little Liars final episodes begin Tuesday, April 18 at 8 p.m. on Freeform.