Audio problem: When Aunt Marge asks Vernon for "a bit more" brandy the second time, her mouth doesn't move. (00:02:45)
Audio problem: At Hagrid's, as we are hearing Fudge's voice saying, "The Hippogriff known as Buckbeak, hereinafter called the condemned, shall be executed..." it is actually Hagrid that we see talking, as we see them standing at the window. (01:26:00)
Audio problem: In Lupin's Boggart class when Ron gives the spider skates, it cuts to Lupin saying, "You see? Very good.", but the words aren't in sync with his mouth. (00:41:35)
Audio problem: The song "Something Wicked This Way Comes" is staged with a mixed choir, with a majority of girls. However, to the trained ear, you can tell the song is sung by an all-boys chorus.
Audio problem: In the Knight Bus, when Shrunken Head says, "Yeah, take..." in the front shot, his mouth, cheek and jaw move as he speaks. As he continues, "...it away, Ernie! It's going to..." in the back shot, his mouth and jaw do not move at all, yet when he says, "...to be a..." his mouth and jaw move as usual. (00:09:20)
Audio problem: Near the Shrieking Shack, when Malfoy says to Hermione, "How dare you talk to me! You filthy little mudblood!" cloaked Harry whomps him with a snowball. In the next wide shot, Crabbe visually asks, "Who is that?" though no sound is heard. (01:02:15)
Audio problem: When Cornelius Fudge says, "Oh yes, indeed, indeed." near the end of the movie, his mouth doesn't move.
Audio problem: When Aunt Marge says, "Vernon, Vernon do something." and the dog charges at Vernon and bites him in his leg, you can hear Vernon scream in pain. At the same time you can see his lips move as he says something, but all we hear is screaming. (00:04:35)
Audio problem: As Sirius, the dog, drags Ron towards the Whomping Willow, Hermione and Harry chase after them. When Sirius actually backs up into the hole below the tree trunk, Ron begins to shout, "Help!" In the next shot, as Harry starts to stretch his arms forward to dive down, Hermione runs behind him and visually she shouts Ron's name, though there is no sound heard. (01:28:15)
Audio problem: When Harry finally pets Buckbeak and the class and Hagrid are applauding, Ron says "Does he get to fly?" but his lips aren't moving. (00:34:15)
Audio problem: When Harry and Hermione have gone back in time and are watching the Dementors attack, Hermione says, "You're dying." When she continues, "Both of you", her mouth is moving before the words are heard. (00:56:05)
Audio problem: When Hermione says "I thought I just saw. Never mind" the second time, it is in a much lower tone than when she first said it.
Audio problem: When Fudge is standing behind Harry's chair, Harry asks, "Sirius Black, you mean?" At the top of the screen Fudge's mouth visibly moves as if he were saying, "Yes", but nothing is heard. (00:13:40)
Audio problem: Ron's "let's go" sounds different before and after the time travel.
Answer: This didn't happen in the book. It appears to be done purely for comic effect in the movie, showing Dumbledore's eccentric and quirky nature. He's seemingly oblivious to what he's doing and how it affects Ron.
raywest ★