The LA Times has a new interview with Oliver and James Phelps (Fred and George). This is just one of the many interviews that are being released before the 6th movie. Here was my favorite part of this interview:
What was your favorite experience working on “Half-Blood Prince"?
OP: That would be being a part of the Fred and George joke shop scene. The crew built an exquisite set, and there are a lot of special effects involved to simulate the magical pops and explosions. It’s a great scene.
JP: I really enjoyed working with the crew. Most of my actual acting I was able to complete in about two weeks. When I wasn’t acting, I would help the crew set up scenes and shots. I learned a lot more about direction and filmmaking in general, and that was pretty cool.