Two additional photos from the Harry Potter and the Half-Blood Prince movie have been added to USA Today's article, as well as quotes from director David Yates.
According to Yates:
In the books, the memories were a very big part of J.K. Rowling’s story. We’ve actually pared them down in our story, and she was very supportive of th at decision. They’re such an enjoyable part of reading The Half-Blood Prince. But we’ve kind of distilled them down to two or three memories to try to keep everything more in the moment. Flashbacks in movies are tricky things; they tend to hold up the momentum of the story you’re telling.
Thanks to Omundo de Harry Potter for the news.