Below, Wall walks EW through the routines and shares a few behind-the-scenes secrets.

(Hint: One got Channing Tatums seal of approval.)

At 12 years old, of course my childhood imagination went off with that.

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Credit: Angela Weiss/Getty Images

Its cordless, but is it a bulb?

He was like, Oh, I actually invented this ghost lamp.

And he brought it in, and I thought, This is perfect.

Biggest challenge:Everything.

[Laughs] We had four hours to put the group number together.

We couldnt choreograph it in studio.

And I said, Okay, how do I make ghosts appear out of darkness in this space?

I didnt want you to feel like you were watchingSo You Think it’s possible for you to Dance.

The moves and the dancing, it takes like two seconds to make that up.

Its truly directing where the cameras going to go and how its going to reveal each dancer.

And then at the very end, how the dancers disappear.

The dancers response:I dont think they were ever excited.

[Laughs] I think they were always pretty stressed out.

And again, we had no time to execute it perfectly.

There were mistakes every time we did it, and Im on it.

I was like, No, it has to be likethis.

But they knew I trusted them, and they trusted me.

They wanted to do so well for me, and they really believed in the vision.

It was just so funny that that ended up happening.

I was supposed to have eight ghosts.

Seven actually works better, though, for lineups.

I dont feel there is a relationship, and I dont feel there should be one.

Thats what this entire piece is about: how to deal with that confrontation.

Im really bad at confrontation.

Ive actually gotten a lot better because of these situations.

Im really happy that this was represented in the body of work, because its extraordinary dancing.

The choreographys great, but its not about the choreography.

Youre watching two amazing male dancers dance together.

Their technique and execution is beautiful.

Thats just the story of my life on this show.

Theres not a lot of time.

Youre very vulnerable in those moments.

Im proudest that: I got this story out there.

I kind of got something off my chest.

Its a way of dealing with things for me; its therapy.

I dont go talk to somebody I create a piece about it.

Thats what Im most proud of not only did I create art, I got something off my chest.

I took a weight off my shoulders that was bearing down on me.

One thing people dont know:I was planning this piece pretty much all season.

And I was like, Yeah, but what if he doesnt make the finale?

Because he wasnt getting the greatest routines.

Toward the end, he was getting kind of, I felt, shafted.

And then he didnt make the finale, and I was like, Told you so!

We waited too long.

I truly believe that if they had done this routine earlier, Jim would have been way up there.

You cant deny that routine.

And she said, I love Travis.

I havent danced in five years, but lets try this.

I realize I can toss her around.

The routine starts to really come together.

I left it up to Jenna, and Jenna said, Lets do it.

She was going for it, too.

She was ripping at my skin, and she brought me to a new level.

I was feeling it 100 percent.

Channing Tatum was in the audience, and he was like, Yo bro, that was so hot!

And I was like, And my days made.

He was so excited to see her dance again, too.

We couldnt do the lifts over and over again, because I couldnt take it.

Jenna Dewan-Tatums response:She was really excited to whip her hair around.

I think she just liked being tossed and being pulled everywhere.

I was proudest of:I like how butch I looked.

[Laughs] I was like, Okay, Im believable.