180 Degree Rule and Match on Action Cuts

The 180 degree rule is a film editing guideline which shows that two characters should have the same right/left relationship to eachother. From then on the camera cannot cut accross the invisible line. If you cut across the invisible line connecting these two characters (or other elements) their eyelines will no longer match, you have broken the rule and viewer will notice that they are watching are film. However you can break the rule by having the camera pass/pan over the invisible line. The new shot from the other side is known as a reverse angle.

http://video.google.co.uk/videosearch?hl=en&q=180%20degree%20rule&um=1&ie=UTF-8&sa=N&tab=wv#q=180%20degree%20rule%20&hl=en&emb=0&start=0

Match on Action cuts form the basis of continuity editing. They allow for smooth transitions between shots and tend to emphasize something. Whether it be putting on a shoe or grabbing a door handle, the camera will zoom in from the establishing shot and will get a close up of the 'action'.

http://video.google.co.uk/videosearch?q=match+on+action&hl=en&emb=0&aq=f#q=match%20on%20action%20cut&hl=en&emb=0