If you add all of those times up, it's only about 10 minutes. I wonder why they just can't keep the scenes in - especially the Dursley ones?

As for the R/HR dance scene - was such a scene filmed? They didn't really "show" a dance in the book - Ron said to Hermione, come on, let's dance when Krum came to their table. But then the scene just shifts to Harry talking to Krum.