What are considered to be the most important elements of storytelling in a short film - A good script

A good script is very important to a short film as many use dialogue for most if not all of the duration, thus making the script vital for the audience’s participation and enjoyment. An example of a good script being used is in the short film Goodbye to the Normals, directed by Jim Field Smith, which is mainly a conversation between a boy and his father which would not be entertaining if it were not for the good script.