During the last scene when Hubbell sees Katie from across the street and goes over to speak with her, both of their coat collars move up and down from scene to scene. On her close-ups, her collar is flat, on wider shots, 1 side sticks up. Same with Hubbell's. When Katie hugs him goodbye, she even has her hand on his neck, forcing the collar down but in the next scene, it has popped back up by itself.