Spoilers below for the Season 2 finale for This Is Us, so be sure to watch before reading on.
With an entire This Is Us episode centering on a wedding for someone within the Big Three, audiences were waiting on emotionally sharpened pins and needles to see what would go down. Some new mysteries were seeded into the narrative, of course, but the Season 2 finale thankfully cleared up one recently introduced curiosity: Old Jack. As it was explained, Old Jack was part of Kate's pre-matrimony jitter dreams, and here's why the creative team decided to bring that element into the finale, according to This Is Us co-showrunner Elizabeth Berger
This Is Us did get Jack involved with Kate and Toby's wedding in other ways throughout the episode, such as Kate deciding to pour some of Jack's ashes on that tree, and how the wedding itself was interspersed with memorable moments withJack from Kate's childhood. So the writers technically didn't need to figure out a way to get a new look out of Milo Ventimiglia, but Kate's dream sequence definitely added further proof of just how emotionally devastating Jack's death continues to be in her life. (As someone whose father died years before my own wedding, I definitely understand how seemingly subdued feelings like that can rise to the surface during big life changes.)
Such a germane reasoning paid off, too, because it was indeed as poignant as television-ly possible to see present-day Rebecca getting to once again share smiles with the (former) love of her life. It would have been great had it happened in a grocery store parking lot, but setting it as a 40th anniversary vow-renewal was about as smart and thematically valid as anyone could have hoped for. It should have felt weird, considering Miguel is married to this Rebecca, but nope.
When speaking with TVLine, co-showrunner Elizabeth Berger remarked on Mandy Moore's work during the scene, praising the nuanced differences between this performance and her normal current era performances.
Sadly, This Is Us won't be giving us young, middle-aged or old versions of Jack in the near future, as the NBC hit won't be back in primetime until Season 3 hits next fall. Check out what co-star Jon Huertas told us about Miguel's future with Rebecca, and head to our midseason premiere schedule to see what'll be debuting and returning in the meantime.