As I have never done any form media before, I learnt quite a lot by doing this exercise.
During the filming, I picked up on a few things regarding acting, lighting and how the camera works.
Firstly, while filming, you have to make sure that everything is the same if you repeat that scene, or start a next scene from that point. For example, if you film someone coming down the corridor then stopping at a door that is closed, you have to make sure that the next scene starts with the same door and have it closed. We made an error of having the door open and then closed, and it wasn't until we watched it back that we realised that the mistake was made.
Lighting has to be well constructed as well. If an area is too dark, then faces and objects will not be clear to the audience. If natural light is not available, then artifical light should be used.