In a dialogue scene between two characters, a straight line can be imagined running between the two characters, and extending to infinity. If the camera remains on one side of this line, the spatial relationship between the two characters will be consistent from shot to shot, even if one of the characters is not on screen. Shifting to the other side of the characters on a cut will reverse the order of the characters from left to right and may disorient the audience.
This is an example of a good continuity scene where we used the 180 degree rule to get a good perspective of both actors when they are talking to each other.
in this small scene, it is a very bad example of a continuous scene because the 180 degree rule isn't applied correctly