SPOILER ALERT: This story contains key plot points from Tuesdays series premiere ofThis Is Us.

An actor who has an epic meltdown on the set of his hit sitcom.

What do all of these people who are turning 36 years old have in common besides the same birthday?

GALLERY: Most Shocking TV Moments of 2016: THIS IS US Season 1, Episode 1 - “Pilot” - Sept. 20, 2016 Mandy Moore and Milo Ventimiglia

Credit: Ron Batzdorff/NBC

Lets hope that its not right now as you read this story.

Whenever you had that moment of Ohhhhhh!

I remember specifically reading the camera pulling back and seeing everybody was wearing 70s-style clothes and lapels.

I think right around there was when I was like, Oh my god… Im the third kid?

My jaw was on the ground.

I was telling my wife, Ryan, youve got to read this!

Youve got to read this!

and she was like, Its pretty damn special.

I was like, Oh,damn!

And you want to hear all the in-between moments and what happened when they were kids.

MANDY MOORE:I think most people arent clicking until he offers the cigarette to [Jack].

Thats the moment where youre like, Wait…. Thats when I was like, Oh, whoa!

Then they pull back, and you really see the television and whats on the news….

I didnt see it coming at all.

MILO VENTIMIGLIA:A, it was clever.

B, it was something that was truly unexpected.

I did not see that coming…

When grown-up Kate says, What was it that dad said about the lemons?

This is how the show is going to work.

And I was like, Wait, wait.

What are they going to do with the baby?

And I was like, Oh, I got it!

And of course then I was trying to be Magnum P.I., trying to figure it all out.

You make lemonade out of lemons.

Because things happen for a reason…. Its so beautiful on so many different levels for me.

We put period cars in the modern storyline just to blur the line a little bit.

But I feel like nurses and doctors will be onto it before anybody else.

I feel nurses and doctors will watch the show and go, Oh, come on!

They havent used that in 30 years!

Just show it all.

I dont think were going to have a problem.

Youre just not expecting it.

The bra that I had on top of my T-shirt was vintage, like, deadstock.

Everything was pretty period-correct….

I think I said something like, 1970s or hipsters?

What do you think?

I love that John and Glenn didnt necessarily go out of their way.

VENTIMIGLIA:People are just like, Oh, wow.

Yeah, this guy must live inSilver Lake.

There was definitely a kind of timeless quality, but yet, it worked today.

I got to work out just for my own well-being, sanity and health.

But I just kept eating.

The [box labeled] 79 photos.

REQUA:We have to tip our hat to the hipsters of the world.

Because in their bedroom, they have a vinyl record player.

I live in Los Feliz; there are people dressed like that on the street every day.

Hipsters really saved us.

NEXT: You start to see this codependence thats maybe a little unhealthy.

[pagebreak]

On the relationship between the three siblings:

METZ:Theyre all three very different.

But you notice that Randall and Kevin might not be as close as Randall and Kate.

And I think you start to see this codependence thats maybe a little unhealthy.

And so I immediately reached out to him, in terms of what his socialization was like.

Did they raise him as African-American?

Did he feel connected to his culture/community?

What did he have to do so that gain access to that community?

So, Im very interested in charting that journey for Randall as well.

MOORE:That is a focal point for Randalls character and [Jack and Rebeccas] relationship with him.

On the relationship between Jack and Rebecca:

VENTIMIGLIA:Everybody talks about best friends, what not.

Theyre pieces that fit together.

Theyre very loyal to one another and loving to one another, and supportive of one another.

Were not living in the world of night nannies and all that.

Sometimes theyre just interrelated thematically; sometimes theres a direct cause and effect.

So youre getting the full picture of a character, and the elements of a character.

The ways in which the past helped to shape the present.

It just goes deeper.

Its a show that doesnt fan out, it just becomes more deeply rooted into the earth.

To go behind the scenes ofThis Is Us,click here.