Especially when they're shooting on one side of a street near dusk (quite common for the good light) in downtown... yea, it's easy to assume you can walk on the other side of the street before realizing that the crew has shut down the entire block since they're capturing shots across the open street and all those randos walking on the other side of the street are extras.
That said, they'll often just let you wander across as long as you're not wearing distracting clothing.
That said, they'll often just let you wander across as long as you're not wearing distracting clothing.