what was the biggest on-set behavioral change that directors had to make after the conversion to talkie films?

Explanation:

The directors screaming to the actors to give instructions and it was normal behavior in silent movies, sounds technician had more experiences for the theater, and they had to silence the directors, the sound was being recorded, imagine the shouts of the director in a movie.

On-set there are a lot of people and everyone had to keep silent.

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