Several scenes in a movie require a lot of people to appear on-screen. For example a scene of a party where it needs a lot of people to appear together. I heard crews of the production unit and even often their kith and kin are used to fill the space as random people. Now my question is are heroes or heroins who are cast as lead role in a film used to fill the space if they don't have direct shots in that particular scene?
This question popped into my mind when I saw a picture in Facebook where the uploader claims "Heath Ledger" is used to fill space in a scene in "The Dark Knight". Here is the picture he uploaded:
Now nobody in that group could tell whether it is true or not. I am not interested about this particular picture because this is hard to know about this particular scene. But I want to know if people with so much importance can be used this way.