Continuity mistake: In the chess scene, at the end of the (overlong) montage of shots of pieces being smashed, the White Queen turns her attention to a Black Castle. The first stroke of her sword clearly goes through the structure of the castle, which disintegrates. We cut to various different angles and watch pieces of the destroyed castle flying all over the place. Cut back to the original angle, and we see the Queen attacking again, but the Castle is completely intact - only the figure from on top of it is missing. And it can't have been the second castle, since that's Hermione's position. (01:58:26)
Visible crew/equipment: In the Key room after Hermione asks, "What's this all about?" Ron takes his wand out and starts for the door. In the wide shot facing the door as he and Hermione pass to Harry's left the BAR attached to the underside of the broomstick bristles is visible. It is not visible in other shots. (01:58:30)
Revealing mistake: When Ron is hit by the Queen during the chess game, the stunt double is visible on the horse just a few moments before he falls. (01:59:00)
Visible crew/equipment: After escaping Devil's Snare, Harry, Ron and Hermione enter the Key room. When Ron says, "You're the youngest seeker in a century." In the next shot of Harry as he grips the broomstick, the wire that it hangs from is clearly visible at its bristles. (01:59:15)
Visible crew/equipment: Being chased by the flying keys, as Harry zips by on the broomstick he tosses the key, Hermione catches it and runs to the door. In the next shot, a close-up, as she tries to unlock the door, an electrical cable hangs down beside the column, that was not in the previous shots. There is also an electrical cable coming out from under the back of Hermione's sweater that is blatantly visible as well. (01:59:55)
Revealing mistake: During the chess game the Queen attacks the Knight's horse that Ron sits upon. In this close-up just before the spear actually hits the side of the horse, the large hole, used to aid the stunt, is visible in the belly of the horse between the stirrups towards the hind legs. This hole is not in previous shots. (Visible in fullscreen DVD.) (02:05:10)
Visible crew/equipment: After the Queen attacks the Knight's horse during the chess game, Ron goes flying back and falls. In the shot as he hits the ground, the black protective gear that he wears is visible when his grey T-shirt rolls up and the button on his left cuff is open, yet closed in the next close-up. (02:05:15)
Visible crew/equipment: When the Queen attacks Ron's horse during the chess game, in the shot from behind Ron as he falls, the black straps attached to the horse's left rear leg, used to aid the stunt, are completely visible. (02:05:15)
Continuity mistake: In the chess scene, when Ron falls off the horse, he is lying on his side on the floor with one knee bent so that one foot is higher than the other. When Harry and Hermione run over to check on him, one foot is on top of the other. (02:05:15 - 02:06:00)
Continuity mistake: Harry speaks with Quirrell near the Mirror of Erised and the arrangement of the cloth in his turban differs in two shots than in the rest of the shots. First in the shot facing Harry as Quirrell says, "While everyone else was running about the dungeon, he went to the third floor to head me off," and then in the back shot just before Quirrell unwraps the turban, after Voldemort says, "I have strength enough for this." (02:08:05 - 02:09:45)
Continuity mistake: At the end-of-the-year feast the Slytherin banner is green and gold, but their house colors are green and sliver, as evident by their robes. (02:11:00)
Continuity mistake: After Voldemort's soul flies through Harry, he crashes down on the stairs and his hand sticks out over one of the steps. In the next shot of Harry lying there, his hand no longer lies over the step. Harry is knocked out and could not have moved. (02:13:20)
Continuity mistake: After the final confrontation Harry has scratches on his face, particularly one on his chin. When visited by Prof Dumbledore the chin scratch is barely there but in the scene in the refectory it is back and appears larger than before. (02:14:00 - 02:17:50)
Continuity mistake: As the students board the Hogwarts Express to go home, the cuts on Harry's face, particularly near his eye, differ in severity during this scene depending on the camera angle in a given shot. (02:21:55)
Continuity mistake: While Harry and Hagrid stand beside Hogwarts Express, in the shot looking up at Hagrid as he takes the album out of his pocket, his thumb is on the back cover as he begins to say, "This is for you," yet in the next shot of Harry taking the album, Hagrid's thumb is on the front cover. (02:22:05)
Audio problem: In the scene at the very end of the movie when Hermione and Harry are getting on the train, Hermione says, "Feels a bit strange going home, doesn't it?" Harry responds, "I'm not going home, not really." If you look closely, Harry says the words and his mouth moves. Then the camera changes angles and Harry mouths the same words once more, but no sound comes out. (02:23:15)
Other mistake: In the scene near the end of the movie where Harry boards Hogwarts Express to go home, Hagrid stands on the platform and waves goodbye. He is wearing a coat and looks huge, as usual, but you can see when he waves, that his hand seems rather small compared to the rest of his huge frame. (02:23:15)
Revealing mistake: At the end of the film, when Harry is leaving on the Hogwarts Express, and the overhead shot shows the train pulling away from the station you can clearly see that Hagrid is of normal height, as the train roof is much taller than he is. (02:23:40)
Continuity mistake: Daniel Radcliffe, the boy who plays Harry Potter, has naturally blue eyes. In some shots Chris Columbus, the director, changed Daniel's eye color. But Chris C. didn't want to use that the whole time. It's not a lighting problem.
