For sure, but there's a lot more to a film than the plot although if a copy of a plot was too exact one would likely run into problems, depending on how a jury felt about it. I wouldn't feel safe (or justified) taking the script of an existing movie and just rewriting all the dialog, for example.

I came across a good, if somewhat dry, article summarizing the current state of play as regards this: http://www.law360.com/articles/591491/plot-thickens-for-scre...