There’s an international controversy hiding in one scene of this blockbuster movie-and it says a lot about Hollywood’s hope for its success.

There's a new angle in the summer face-off between Oppenheimer and Barbie. It's over which of the two movies is more politically controversial. The odd thing is, Barbie might win. What might tilt the competition is a single shot in the film, lasting just a few seconds. It occurs when Barbie looks at a map of the real world. Barely visible on the map—but flashing like neon strobe lights to some viewers—is a dotted line in the middle of a sea. The government of Vietnam took that to be the infamous "nine-dash line" that the People's Republic of China draws…