From the perspective of someone who has worked in the film industry: how a crew interacts with and treats bystanders is generally very telling about where they are on the "amateur-professional" scale.

In my experience, professional productions are usually very intentional about not getting in the way of people just trying to go about their day. We were filming at a busy coffee shop in January, and we held for filming whenever a customer wanted to buy a coffee. The producers were pretty serious about not disrupting the business we were filming at.