As a concept, “Paul” has more potential than any film to come around the bend in a long, long time. First and foremost the film stars Simon Pegg and Nick Frost, who also handled the scripting duties, and since Pegg is largely responsible for movies like “Shaun of the Dead” and “Hot Fuzz”, you can’t be blamed for expecting big things. Add Greg Mottola (“Superbad”, “Adventureland”) to this mix, and you seem like you’re well on your way to something wonderful.