A film has verisimilitude if it seems realistic and the story has details, subjects, and characters that seem similar or true to real life, or mime convincing aspects of life in important or fundamental ways

For example:

1. In Harry Potter, Hogwarts although about magic and wizardry; still has sports, homework and detentions which relates and grounds the viewer to the film.
2. If a character is always a good person then the film must make sure he does good deeds and is never evil otherwise that betrays the verisimilitude of that character.