Audio problem: At the cemetery, as Harry lies on the ground, when Voldemort leans over him and says, "If they speak of you they'll speak only of how you begged for death," in the shot facing Harry, before Voldemort continues to speak, his mouth still moves, though nothing is heard. (01:27:25)
Audio problem: In the scene right before the champions enter the maze, Cedric Diggory hugs his father, Amos. When they pull away, Amos says, "That's my boy," but his lips aren't moving.
Audio problem: Before the start of the third task, when the champions make their appearance, the band is playing in the stands. The sounds of the bass drum are not entirely in sync with the girl who is pounding the mallets on that bass drum.
Audio problem: Just before the Death Eaters attack the tents, Arthur Weasley says to Fred and George that "Ginny is your responsibility", but his lips don't match what he is saying.
Audio problem: When Fred and George mimic Arthur by saying, "Feet off the table" their lips don't move. (00:06:50)
Audio problem: After showing the three unforgivable curses Moody comes down the stairs to Neville and says, "Son, are you alright? Come on, we'll have a cup of tea." However, when he says, "Come on" his mouth isn't moving.
Answer: Not at all. In fact, David Heyman made the decision for his eyes to be blue in the films for him to be more scary! They felt that his red eyes in Sorcerer's Stone did not show enough emotion to make him an evil character. It was felt in Goblet of Fire that the light blue eyes would be perfect to show his evil in the moonlight, and they kept it on for later films.