There are obviously some MAJOR spoilers ahead!
1. First, in Barbie (2023), when Barbie arrives at Ken's Mojo Dojo Casa House to ask him if she can still be his "long-term distance, low-commitment, casual girlfriend" and Ken yells, "Sublime," the line was improvised by Ryan Gosling while filming. Margot Robbie said she "wasn't prepared" for it on the day and started laughing.

2. In Little Women (2019), when Laurie and Jo have their conversation on the hill, where Laurie continually interrupts her with, "I love you, Jo," all of those weren't in Greta Gerwig's original script but were added by Timothée Chalamet while filming.
