Harry Potter and the Half-Blood Prince, the sixth instalment of the wizard franchise, was released to U.S. theatres less than two weeks ago on 15 July (09) but has already notched up a whopping 57 mistakes, each detailed on website MovieMistakes.com.
In one scene, Rupert Grint's character Ron Weasley can be heard speaking but his mouth doesn't move, while in another, Daniel Radcliffe's Harry Potter appears with a windswept and messy hairstyle just seconds after his locks were neatly combed.
The number of blunders means the latest Harry Potter movie is leading a list of the year's most mistake-ridden films, toppling Transformers: Revenge of the Fallen, which was littered with 53 bloopers.