Post 3 - Continuity

Continuity is a detailed script used in making a film in order to avoid discontinuities from shot to shot.

Match on action - This is where for example if someone is running, and the camera cuts to a different shot of the person, it will have to be edited so the person in still on the same foot while running.
Also there are rules on Continuity, the 180 degree rule, you may not pass over 180 degrees, when doing a reverse shot.