The functions of dialogue

Dialogue performs 2 functions: 

1) moves the story along

2) the flesh out characters - give them personality and depth

1. What is the purpose of putting this scene in the film?

Describes the relationship between Django and Stephen - "you two should hate each other" 

and the fact that Django is a free man - "Django's a Freeman. States that Stephen doesn't like Calvin Candle - "I miss you like a rock in my shoe"

2. What key info do we get in the dialogue to move along the story?

Django is a free man, he is staying the night, and Stephen doesn't like Calvin Candle and he doesn't like the fact that a black man is gonna stay in the bus house. 

Film dialogue is stylised; not real.