What are the main existential themes in Pleasantville?

One of the most existential elements that come out of the
film is the struggle to define reality in complex terms. Life in Pleasantville is a
black and white existence.  This is both literal and figurative.  The simplicity that is
presented in Pleasantville is challenged with the presence of colors, and divergent ways
of thought.  This causes an existential crisis in the citizens of the town as it impacts
their state of being in the world and how they interact with this world.  It is also
existential because there is little in way of answer.  The ending of the film reflects
this, where the husband, wife, and her lover are sitting on the bench and wondering what
will happen to them next.  This is highly existential.  No character has "the answer." 
No character has a transcendental figure to which they can turn for guidance.  Each
character is left to "choose" what is to happen to them, as there is no script, no
director, and with the presence of color, only freedom and choice as their companions. 
This is highly existential in nature as it allows individuals to get away from "bad
faith" and force the issue of choice upon their own in determining their destiny and
their identities in the modern setting.