In the film adaptation of Arthur Miller's play The Crucible, reality is depicted in a few different ways.
First, the opposite of reality is depicted when the girls pretend to see the "little bird" flying around the courtroom. While many of the court officials believe this to be real, the girls are making the bird up.
Second, the emotions shown by Elizabeth are most certainly real. The casting of Joan Allen was perfect. She plays a woman torn by her love for her husband and the anger at him for having an affair. Her emotions, therefore, depict the reality of a woman lost between forgiveness and anger.
Lastly, John's speech at the end of the movie, when he is in the water and declares that "God is dead" makes for a very realistic moment in the film. His reaction to the atrocities which have been going on in Salem are realistic and so is his emotional break.