What is the significance of dramatic techniques such as exits and entries, sub-text and structure in the play
When important and secret conversations are had on stage with another character on the way to or from the stage, there is a tension built around the potential for "being discovered".
Also, the action at the end of the play where Proctor is killed is conducted off-stage. This allows for the audience to imagine the act and also allows Elizabeth to become the focal example of how we/the audience should respond. Her response becomes our response because she is the only character left on stage.