"I think we just knew that we had a movie when Rachel walked in the room"

In this quote, Ryan Gosling is expressing his belief that the film they were dealing with had lastly come together when Rachel, probably Rachel McAdams, entered the space. This suggests that her existence brought a specific energy or chemistry to the job that was missing in the past. It also indicates that Gosling and possibly others associated with the movie had actually been struggling to find the ideal tone or direction, but with Rachel's arrival, everything formed. This quote highlights the importance of casting and the effect that one individual can have on a task. It also talks to the power of cooperation and the function that each individual plays in developing a successful film.