This Is Us knows how to tug on its audience's heartstrings in every episode. The show does a great job of making the viewers themselves feel a part of the Pearson family — we celebrate the joyful moments with the Pearsons, and conversely, we grieve and cry with them in the devastating moments.
This puts some pressure on the actors, who are bringing these characters and scenes to life. Luckily, they have lots of time to mentally prepare — they often know major spoilers pretty early on. For example, Ventimiglia knew about that big season one reveal long before the audience did.
(If you haven't watched, spoilers ahead!)
The actor spoke about this big moment with Vulture, sharing, "I knew in the beginning that Jack was dead in the present day, and then once the events of his death were sorted out and kind of agreed on by Fogleman and the producers and the writers, Dan's always been very kind with giving us as much information as we need to inform our performances."