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 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)
Revealing mistake: In the graveyard, when Voldemort puts his foot on Cedric's face, Cedric's eyes are staring straight up. As Voldemort pushes, Cedric's eyes do not follow his head's movement, but continue to stare at the point that would have been straight up from his head's original position.
Continuity mistake: After Frank places the kettle on the burner, when he steps in front of the sink in the wideshot, the window is behind the sink, in front of Frank. There are plants on the sill that reach the window handles. However, after Frank sees the mansion light and puts the teapot down, in the close-up of the window the center plant is gone and the left plant is different. (00:01:30)
Continuity mistake: The amount of eyebrow hair, just over Moody's magical eye, differs in various consecutive shots of him throughout the film. It goes from some hair being caught under the casing, to all of it being over the casing, and vice versa; such as when he begins to feel the effects of the Polyjuice Potion diminishing, and he looks in the cabinet. (It is Moody's eyebrow over the casing, not a piece of fabric.) (00:25:20)
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.