Continuity mistake: During the Hungarian Horntail challenge, the dirt smudges on Harry's face noticeably change in consecutive shots, within the same time frame.
Continuity mistake: Dumbledore wears a thin silver strand, with dangling silver balls, tied round his beard throughout the film, and the position of this strand differs in consecutive shots, depending on the camera angle. For example, when Dumbledore stands beside the pensieve, whilst speaking with Snape, McGonagall and Moody.
Continuity mistake: During the first part of the movie, Moody doesn't have a eyebrow over his Magic Eye, it is clear because you can see the stitch marks. Then when he is talking to Harry he has a bushy white eyebrow where there wasn't one before. (00:25:20)
Continuity mistake: Just before Moody turns Draco into a ferret Harry has a confrontation with him and pushes him. In the first shot right before Harry pushes him they are almost face to face. Cut to behind Harry after he pushes him and Draco has been pushed back several feet. Cut to behind Draco just as Harry says 'he's vile and cruel' and they are now almost face to face again. (00:48:40)
Continuity mistake: After Cedric Diggory is killed in the cemetery, his body changes position during the scene, particularly its proximity to the Riddle monument.
Continuity mistake: When Mr. Weasley, HRH, and the rest reach the boot Portkey, to take them to the Quidditch World Cup, in the first close-up of the boot (with the sky behind it) there are many very tall blades of grass on the mound around it. In the next shot, just as they start to encircle the Portkey there are much less single tall blades - before anyone has had a chance to stomp on them.
Continuity mistake: When Harry is to meet Sirius in the common room the camera moves in on him as he walks towards the newspaper lying on the chair. You can see a table there as well with two books on it. When it cuts the books has been replaced with several other items.
Continuity mistake: In the scene when Harry is talking to Sirius Black in the fire, Sirius has a large piece of wood below his right nostril in all of the close-up shots. But in the shots that are farther away, there is no large wood piece, and instead there is a smaller one that is on fire.
Continuity mistake: When Barty Crouch places the chalice on the table he has his hand under the piece of cloth lying on top of it. When it cuts to Dumbledore you can see Barty in the background with his hand outside the cloth.
Continuity mistake: As Dumbledore calls out Harry's name for the Tri Wizard Tournament we see Ron sitting behind looking rather annoyed. We see him sitting up and looking to his right as Harry walks towards Dumbledore. Then as the camera switches angles he is now leaning forward.
Continuity mistake: After the 3rd task, as Moody is taking Harry back into the school, the camera cuts back to the students. Neville stands to the left (viewer's right) of Viktor Krum and the Bulgarians. In the next shot Neville stands to the left (viewer's right) of a girl, who is seen in the next shot standing beside Ron, Hermione and other students (not the Bulgarians); Neville is out of place during these shots.
Continuity mistake: In the scene where Harry is in the Pensieve, a woman sits down behind Harry. In the following shot (as Dumbledore shakes hands with someone through Harry), she walks down the stairs and sits down again. (01:39:40)
Continuity mistake: When the TriWiz chalice is revealed the camera zooms in on the chalice and you can see there is no one standing near it. When it cuts Igor is suddenly standing right behind it.
Continuity mistake: In the Gryffindor common room, after Ron heads up to the dorm, Harry realizes Sirius has gone. In the close-up of the Daily Prophet, the unwrinkled headline "Teenage Tragedy" is displayed prominently as the newspaper burns up, whereas in the previous shot (before Harry's close-up) the "Teenage" part of the headline is unseen. (00:45:10)
Continuity mistake: After Barty Crouch Jr. says, "I'll show you mine, if you show me yours," when Dumbledore grabs Harry's injured arm, the wound and the way he grips Harry's arm differs between shots. (02:11:20)
Continuity mistake: In the scene after the old caretaker is killed, Ron is seen sleeping on the bed and as Hermione is about to wake him up his arms change position. His right hand is first resting on the pillow, when it cuts it's under the pillow. (00:03:55)
Continuity mistake: In the dining hall, when Ron unwraps the box with his awful dress robes and "bonnet," the position of the wrapping, box, etc., differs between shots.
Continuity mistake: After being knocked off his broom by the Horntail, when Harry falls from the first window to the one below, tiles break off leaving a few askew. However, in some following shots the tiles are back and straight. (01:00:50)
Continuity mistake: At the Quidditch World Cup, when Cornelius Fudge welcomes everyone, the way he is holding the wand to his throat differs in the two shots facing him and the shot from behind. (00:09:10)
Continuity mistake: During the scene where Harry is in the Prefects' bathroom after he has submerged the golden egg in the water, his wet hair keeps changing positions as he's talking to Moaning Myrtle, even though he doesn't touch it. Harry's hair changes position in consecutive shots, during other scenes in the film as well.
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.