From Yahoo!

What's the deal with Emma Watson's hand in the new "Harry Potter and the Deathly Hallows" trailer? Well, Hermione (played by Emma Watson) is a wizard with special powers, which might explain why her hand is magically clean, despite looking dramatically different in an earlier preview of the movie.

In a sneak peak of "Deathly Hallows" that appeared on the DVD for "Harry Potter and the Half-Blood Prince," Emma Watson's hand in the same scene was clearly covered in blood (read: something along the lines of corn syrup and red food coloring).

Here's a comparsion with the DVD sneak peak and the same shot in the trailer:



Why the change? A representative for Warner Brothers, the studio behind "Harry Potter," didn't have an official comment on the matter at press time, but the Motion Picture Association of America can be pretty tricky when it comes to trailers. As anyone who's sat through the previews that show before a movie knows, most trailers begin with a notice that it has been "approved for all audiences." Translation: the trailer is as suitable for children as it is for adults. In other words: No blood.

A popular recent example of a trailer being edited so as to meet the MPAA's standards for appropriateness happened with the one for "Indiana Jones and the Kingdom of the Crystal Skull" (yes, the one with the monkeys). In a scene that takes place at the beginning of the film, Indy and company are captured by Russians -- of course, those menancing Russians have guns. So, of course, when the scene found its way into previews, there were no guns to be found in that scene.

If it weren't for the savvy eyes of some the devoted Harry Potter fans at Mugglenet, no one might've noticed the change. What Warner Brothers did with the "Deathly Hallows" trailer looks good. Hermione's clean hand looks like Hermione's clean hand. Contrast that with the "Indiana Jones" editing incident, which resulted in pants that were clearly computer generated (where the gun used to be): what was intended to protect audiences from seeing something too adult probably caused a lot more of an uprising than if it had been left as is.