3. Population of 14
At the beginning of the movie, a sign says that Perfection has a population of 14 people. The math on this checks out; if we discount Rhonda, who’s a graduate student (presumably from a neighboring college), and Howard and Carmine (who are jackhammering a nearby road, but may be contractors who do not live in Perfection), there are 14 characters in the movie: Earl Bassett, Val McKee, Burt Gummer, Heather Gummer, Melvin Plugg, Nancy Sterngood, Mindy Sterngood, Miguel Sanchez, Walter Chang, Nestor Cunningham, Edgar Deems, Old Fred, Jim Wallace, and Megan Wallace.
If Val and Earl stick around after the events of the movie, the town needs to update its sign to 8 people. If not, it’ll be down to 6 people.