Analysis of 180° rule.

The 180 rule.
The Rule is used so the audience do not get confused about the characters and where they are stood etc. This example shows how the camera stays on one side of the characters, keeping the same characters on the same side of the screen, even though the camera cuts to a different angle.
This is an important, simple rule which isn't obvious, yet would hold some footage together in order for it to make sense. If editors and directors didn't stick to the 180° Rule, the audience would notice immediately and rightly be confused.

This is an example of the 180° Rule: