Think about this; The first thing u do when you go to take a photo is to compose it. Line up the subject, ensure the lighting isn't too brigh / dim / etc. Ensure you aren't taking a photo in front of say, an overflowing hamper of dirty laundry; a sink full of dirty dishes, etc.

This goes quadruple for professional photographers / videographers / media production.

Literally nothing - NOTHING gets into the shot unless it is specifically, consciously PLACED THERE by the production team.