It wasn’t until about mid-March that the U.S. began to go into lockdown around the country in response to the coronavirus. Prior to that, it’s true that a lot of people simply weren’t paying the situation much attention, and for those that were busy filming a movie, there was probably even less focus on it. Aubrey Plaza’s comments make it sound like, at the time, there really wasn’t an understanding of exactly what was making people sick. It was likely believed at the time to just be the flu, and people only put the pieces together after the fact.