A Few Words from Jack
In the 1990s again: Jack and Rebecca faced each other the morning after their awful fight, as the latter suggested that her husband stay with Miguel to give the couple some space. This led to an amazing speech from Jack ("You’re not just my great love story, Rebecca. You were my big break. And our love story - I know it may not feel like it right now, baby, but I promise it’s just gettin' started.")... which may have been his final words to Rebecca, considering we know he dies around this time.
This was almost entirely a Jack and Rebecca-based finale, but: we also learned Kate (in present day) wants to try a singing career... that Kevin is determined to get a role in that Ron Howard movie and that he loves Sophie... and that Randall wants to adopt.