Film Continuity

180 Degree Rule
This is where there is an imaginary line where the camera moves along to make sure that the shots that come out aren't distorted and the characters are both facing the same way in every shot. It also allows the camera to move around and look at the characters from different angles so that the shots aren't all the same so it doesn't become repetitive or uninteresting.

Shot Reverse Shot
This shot is used to show a conversation between two people by switching between their faces. For the first shot it focus's on one characters face as they look off screen at another character. As the conversation continues it switches between the original character and the one that they are having a conversation. The shots work together as the camera is still on the same side of the character as the 180 degree so that they can be put together without making the scene seem distorted. Another example of a shot reverse shot could be filming first looking in one direction before switching to the other direction.

During this scene from the Hunger Games it shows an example of a shot reverse shot between the two characters Peta and Katniss. It allows the audience to see the emotions that the two characters are showing in the scene which the long shot during the 180 degree rule wouldn't show. 

Match On Action

A match on action is the technique used to show continuity in a film where shots are cut to another shot with the shots matching up the one before it. An example of a match on action is a scene where a character is walking through a door. The first shot would be someone reaching for the handle before the next shot would switch to a close up of the handle being used.

During this scene from Friends it shows how in one shot one of the characters is lunging at another and in the next shot it changes but still connects with the second character which allows the scene to run smoothly without distorting in any way.