It's really weird," she said. "It's so strange. Like so many, as you say, there are so many flash backs in this one. I remember watching it and thinking, 'Wow, we have changed so much.' It's amazing. It's kind of painful in a way because it's kind of embarrassing but at the same time. It's like, oh, yeah we were cute."

Besides acting in the movies, Watson is an avid reader of the "Harry Potter" series, so she knew exactly what parts of the book were left in for the movie and what was cut out.

"Well, I was particularly excited about the house spells and just that whole storyline of taking care of the house and all of it got cut," she said. "None of it made it ... I was really upset."

Disappointment aside, Watson said one of her favorite activities is watching the movie with an audience that has not yet seen it.

"I've seen the film four or five times now … I tend to just turn around in my seat and not watch the film but just watch everyone else's reaction because it's so rewarding to see which bit people laugh at, which bit they enjoy or which bits they cried at," she said.