Continuity mistake: When Harry is deciding to ask Cho to the ball, he is in the doorway to the owlery. When he runs after her, he is in the owlery. No time has passed between the two shots. (01:09:40)
Continuity mistake: In the Great Hall, after Hermione quips, "Well spotted!" Ron imitates his brother (when he asked Angelina to the Yule Ball) by lifting up his arms to mimic dancing, and Snape promptly smacks the back of Ron's head. In the next shot, Ron holds a pencil in his formerly empty right hand. (01:11:15)
Continuity mistake: When the students are dancing to The Weird Sisters at the Yule Ball, Viktor Krum can be seen at the back of the group, jumping up and down, with Crabbe/Goyle jumping up and down behind him with his hands on Krum's shoulders. Immediately after, however, Krum is seen dancing with Hermione, and Crabbe/Goyle has disappeared, with no time to move between shots. (01:16:20)
Continuity mistake: At the Yule Ball, when Harry, Ron, Padma, Parvati, and eventually Hermione, are sitting at the table, Ron's awful dress robe is lying on the table behind him, and it changes position between shots. (01:17:00)
Continuity mistake: Towards the end of the Yule Ball, when Ron and Hermione walk to the staircase, seated on the stairs are two girls who are comforting a third girl in the center. When Hermione shouts, "Ron you spoiled everything," the girls' positions change between shots. (01:18:20)
Continuity mistake: At the Yule Ball, Hermione's hair is done up with the long curl at the back, and at times that long curl is either in front of her shoulders or at her back depending on camera angle. Additionally, even when her hair is normal, it changes in some consecutive shots throughout the film. (01:18:35)
Revealing mistake: During the Yule Ball there is a shot of Professor Moody sitting on a bench tapping time with the music. One can easily see a green object beneath the bench. It is apparent that a hole was cut in the cushion with his real leg hanging below the bench covered with a green leg and foot sleeve. The large green object is his foot with a red dot on his toe. In post production the actor's real leg and foot is to be removed digitally via green screen-like technology and replaced with a digitized artificial one. The red dots are to help coordinate the movements and position of the artificial leg with the actor's real one. This shot obviously got missed by the postproduction team. If you look closely you can also just make out his knee peeking below the fringe of the bench. (01:18:50)
Continuity mistake: When Harry and Cedric are transported to the cemetery, the Triwizard cup lands on the grassy slope, well beyond the Riddle monument, with its luminescent top facing away from the cauldron area. During Priori Incantatem, three shots after Voldemort exclaims, "He's mine!" the cup lies on the corner of the Riddle monument's stone base and it faces the opposite way. The cup is back up on the grassy area in the following shots. (01:19:00 - 01:28:40)
Continuity mistake: On the bridge, when Cedric speaks with Harry about the golden egg, in the shots facing Cedric, the wind is blowing Harry's hair back, yet in all the shots facing Harry his hair is still. (01:22:00)
Continuity mistake: When Harry takes a bath in the Prefects' bathroom, the robe behind him repeatedly changes position throughout the scene. (01:23:20)
Continuity mistake: Whilst Harry is in the bathtub in the Prefects' bathroom, the foamy bubbles on his face and body noticeably differ between consecutive shots, or disappear then reappear depending on camera angle, particularly when Myrtle is being "attentive" to him. This is not due to his moving the bubbles about. (01:23:45)
Continuity mistake: In the Prefects' bathroom when Harry is in the bathtub, just before Harry touches the golden egg and then when he puts his hand on it, both the egg's and his hand's positions differ between shots. (01:23:50)
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)
Visible crew/equipment: When Hermione and Ron are in the library with Harry before the second task, Moody walks in to tell Hermione and Ron to go see McGonagall, and just as Ron puts the golden egg on the table the actor's blue tape mark can be seen on the floor. (01:29:30)
Continuity mistake: Straight after the second task Hermione wraps her own white towel round Harry, but between shots it jumps back to her shoulders, then back to Harry's several times. (01:35:05)
Continuity mistake: When Mad-Eye tells Dumbledore and Fudge that Harry is outside the room, he opens the door with his wand and then proceeds to put it away. When the door opens from Harry's POV, Mad-Eye has still got his wand out. (01:37:50)
Visible crew/equipment: When Harry takes out the licorice snap it cuts him and when he bends down to get one you can see his mic pack. (01:38:50)
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: After Wormtail performs the Avada Kedavra curse and then raises the "bone of the father," he places Voldemort's wand inside the left side of his coat, before he slices off his right hand. When Voldemort says, "My wand Wormtail," Wormtail retrieves the wand from the right side of his coat. (01:56:00 - 01:57:40)
Continuity mistake: In the maze, when Cedric says, "For a moment there I thought you were gonna let it get me," the tear on his shirt, at his right shoulder, is directly on the seam and quite frayed. At the cemetery, when Harry says, "Cedric, we have to get back to the cup. Now!" the tear is not on the seam, and it's smooth with blackened edges. Back in the maze, when Amos approaches his son's body, the tear differs yet again. The dirt on Cedric's shirt changes as well. (01:58:20 - 01:59:40)
Answer: Voldemort's spell undid the Sacrificial Protection that Lily bestowed on Harry, but the Bond of Blood is a separate protection bestowed if the person sacrificing their lives is a relative. THAT spell is still renewed as long as Harry keeps returning to the Dursleys until age seventeen. Voldemort has removed one protection, but a second is still in place.
Captain Defenestrator