Here's an analysis of the London diner scene in Harry Potter and the Deathly Hallows Part One by director David Yates.
http://artsbeat.blogs.nytimes.com/2010/11/18/anatomy-of-a-scene-harry-potter-and-the-deathly-hallows-part-1/?src=mv
You can see this little Ron/Hermione moment in the video at the link that I posted.
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