Deliberate "mistake": When Hagrid steps off the motorbike while holding young Harry, the Dursley's house (with a small bush to the right of the front door) is visible directly behind McGonagall. The house is fully attached on both sides to homes with a one car garage. Yet after Vernon asks, "Who'd be writing to you?" in the shot of the owl dropping the letter which flies through the front door mail slot, the house to the left of the Dursleys (when facing the FRONT) has a two car garage, is not attached to the Dursley's house and is quite a bit away from the Dursley's house as well. Then in Chamber of Secrets, the house to the right (when facing the BACK) is attached once again in the same manner as at the start of this film with young Harry. (Visible on DVD widescreen.)

Revealing: 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.

Revealing: At the snake exhibit, while Harry speaks with the Python the snake's body lies curled over a long wood log and a large rock. In the shot from outside the Python's exhibit, after the glass pane disappears Dudley falls over the rail and the snake is gone, not positioned differently, but altogether gone! In the next overhead shot inside the Python's exhibit, while Dudley falls the snake is back lying on the log and rock, in the same position as in the previous shots.

Visible crew/equipment: Petunia and Dudley enter the house when they return from the zoo, followed by Vernon and Harry. The crew's equipment is plainly visible on the ground beyond the doorway. Also, the pavement at the threshold extends far beyond the doorway and just before Vernon walks into the house, Vernon is visibly coming from the side of the doorway. In the earlier exterior shot when they stand by the car before they leave, as Vernon says, "I'm warning you now boy...," not only is the ground at the doorway completely different, there is a garden surrounded by white bricks beside the door, making it impossible for Vernon to have been standing there. (Visible on DVD fullscreen.)

Visible crew/equipment: Harry, Ron and Hermione, run to Hagrid's hut to tell him that they know about the Stone and they knock on the door. As Hagrid opens the door in the first shot looking out, Harry stands behind his tape mark and Hermione and Ron visibly stand behind their shared black tape MARK on the step.

Revealing: Dumbledore, McGonagall and Hagrid leave baby Harry on the Dursley's doorstep. When the shot opens in the first close-up of the baby, as Dumbledore places the envelope on the blanket, though a good portion of his forehead is visible, the scar is not there. In his next close-up, it is very apparent, due to the position of the scar, that part of it should have been visible on his forehead in the previous close-up.

Revealing: 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. This hole is obviously not in previous shots.

Visible crew/equipment: Dumbledore tells Harry that he will move the Mirror of Erised and not to go looking for it. In the following shot Harry walks outside in the snow with Hedwig on his arm. In the close-up of Hedwig, the jess (strap) around his left leg is visibly tethered to Harry's sleeve. The inside of Harry's sleeve also has a strap that secures the sleeve around Harry's wrist. Hedwig is obviously not tethered in the next shot.

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.

Continuity: As Hermione hides under the sinks the troll smashes the front basin of the second sink on the right, leaving its faucets and surrounding sinks intact. Though in a view of the entire lavatory when the troll holds Harry upside down, from behind Hermione, the entire second sink, its faucets and trim are entirely missing and the entire fourth sink, which was never touched, is as well, both are gone. When the troll is knocked out, as Hermione stands up and moves toward Harry and Ron, though the faucets of the second sink are back, the front basin of the second sink is visibly broken again just as in the original shot, and the entire fourth sink is still inexplicably gone in this shot.

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.

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, is completely visible.

Visible crew/equipment: At the end of term feast, Dumbledore stands and says, "Another year gone." In the next shot of the Gryffindor table, part of the camera equipment is actually visible at the lower right corner of the screen.

Visible crew/equipment: In Hagrid's hut, Harry, Ron and Hermione gather round the table as Hagrid places the dragon egg in the center. As the egg starts to hatch the shell flies everywhere and between Hermione and Hagrid camera equipment is visible at the lower left corner of the screen. This area is clear prior to this one shot obviously.

Revealing: When Hermione dives under the sink to hide from the troll, in the first shot the area around her is mildly semi-wet and the fresh wet impression of a crew member's shoe/boot tread at the bottom right corner. After a quick shot of the troll, the area immediately surrounding Hermione her hand, cloak and foot are highlighted due to CG editing - all before the troll slams his club into the front basin of the sink. (Visible on DVD fullscreen.)

Audio problem: When Harry, Ron and Hermione are running away from Mrs. Norris (the cat), Harry yells, "Quick hide through that door!" and if you look close enough you can see that his mouth doesn't move when he says that.

Continuity: Just after Slytherin scores ten points, Flint and his teammate surround Angelina. When one grabs the quaffle from Angelina, they fly past the second Gryffindor tower – we see the first Gryffindor tower, two staff towers (grey/black), Slytherin tower and the second Gryffindor tower behind them - then Angelina covers her head with her arm. However, in the next shot she actually crashes into the tower that she already flew past.

Revealing: At the zoo, Harry looks to his right, at the 'bred in captivity' sign of the Python. In this close-up, the green plant that is below, to the side of the exhibit sign, is protruding out past where the glass supposedly is, yet this is BEFORE the glass disappears. As a matter of fact, this plant, nearest the exhibit sign, changes its position considerably throughout these shots.

Continuity: When Harry is in the potions class he is caught writing notes down, we see his neat writing in close up ... but when the camera angle changes we can see that the writing has changed in size to very large letters and quite messy writing.

Visible crew/equipment: Harry, Ron and Hermione are in Hagrid's hut and the egg inside the cauldron in the fireplace starts rattling. In the shot looking up at Hagrid from behind the cauldron, at the top left of the screen in front of the fireplace, as Hagrid retrieves the egg a piece of equipment comes down then quickly goes back up and at the top in the center there is a small black film square that is not part of the fireplace.