Mulling it over further (as one does while driving a semi), I also like the expanded ending because it provides narrative structure to what were previously isolated instances in the story. The boys trying to buy soda for Yamada at the water park, the boys who accidentally kicked Yamada with the soccer ball, the boys on the plane, even the drunks at the airport.
Previously, they were just ways to show off how protective Kase was of her Boo. Now they have import they didn't have before. She was dealing with her insecurities in those instances, not just being Supergirlfriend.
I dig it.