When the rogue bludger breaks Harry's arm, it falls limp, he takes his good arm and grabs the snitch. After this the broom spins upside down and you see Harry holding onto his broom with his supposedly broken arm. [His arms flail about a bit, but Harry doesn't use his broken arm. He was holding on with his legs, just as he did when he caught the snitch.]

In the first film, Harry's family clearly live in a small close with trees behind their house - see owls delivering mail. The opening of COS shows Privet Drive to be in the middle of a large housing estate with houses to the rear. [Maybe there was a development over the year he was away?]

When the trio enter the Gryffindor Tower after the Duelling Club, Harry says, "if I hadn't told that snake not to attack Justin", he is interrupted by Ron when he says "Oh that's what you said to it". Harry mimes these words before the shot changes to Ron. [The shot changes too quickly for Harry to mime Ron's lines. He starts to say "then" when Ron interupts him. That's why he appears to mime Ron.]

When Harry falls out of the flying car, we can see several small parcels just behind the front passenger seat - why did none of them fall out as well? [They appear to be tied together, which would not allow them to fall out. Besides, according to Daniel Radcliffe (Harry), they actually had him dangling from the car 25 feet up in the air. Therefore, the parcels would've fallen out when they were shooting the scene if they were going to.]

In the scene with the pixies, Lockhart introduces himself at the beginning as their new DADA teacher. When he reveals the pixies in their cage, Seamus Finnegan makes an exclamation. Lockhart says, 'That's right Mr Finnegan'. Having only just introduced himself for the first time, how did he know his name? [Prior to his class, Lockhart could have received copies of students' files and their photographs to familiarize himself with his future students. It's also interesting to point out, in between introducing himself and releasing the pixies, Lockhart gives the class the 'Gilderoy Lockhart quiz' - a scene that was cut from the movie - therefore another means of giving himself the opportunity to learn their names.].

When Harry drops his wand to look at Ginny, Voldemort (Tom Riddle) walks towards him, and it's not there. Then the next shots show it's there and he stoops down and picks it up. [That is not correct. When Harry drops the vand it slides along the floor and ends up between Ginny and the big face/sculpture where the basilisk emerges later. You can just glimpse it at the bottom of the screen when Tom Riddle walks towards Harry and Ginny.]

In the scene with Dumbledore and Harry after Justin and Sir Nicholas are petrified, Hagrid comes bursting in with a rooster in his hand saying he would swear Harry didn't do it. This scene only makes sense if Hagrid had met Harry in the hall just before the attack, as in the book. Clearly this scene was filmed, then dropped, as it makes no sense in the movie. [True, the rooster is only explained in the book, but Hagrid's entrance still makes sense. He would most likely have heard from one of the teachers that Harry had found Justin and was taken up to see Dumbledore. He found out quickly about Hermione and would have also heard about Justin quickly.]

Check the bathroom part when Ron and Hermione are going to puke after drinking the Polyjuice potion. Ron goes in the first one yet comes out of the one beside Hermione on the far side. [As they are standing there drinking their potions, Harry's head obscures the door to the 1st stall. After Ron drinks his potion, he runs into the 2nd stall and you can see the door close to the left of Harry's Head. Hermonie then enters the 3rd stall and closes the door. As the effects of the potion begin to hit Harry, his head tilts forward and you can now see the door to the 1st stall which is in the closed position. At this point you can see that all 3 stall doors are closed. When Ron, as Crabbe, exits the 2nd stall it is the same stall that he had previously entered.]

During the credit roll at the end of the movie, the credits show that there were three Slytherin Beaters. There are only supposed to be two Beaters per team. We all know the Slytherins cheat, but come on... [Well there might have been a stunt double for the movie or are the last names the same?If they are the same they could be twins who played each others parts. Lastly they may have a substitute for their beaters, since they do get the most bludgers flying at them because they jump in front of them, and since we don't know the rules to Quidditch they may be allowed to have a sub.]

We see Ron break his wand when the car is soaring out of control into the whomping willow tree. When they've landed in the tree, Ron says "My wand, look at my wand". The tree then becomes even more violent, and Ron drops his wand, and says "what's happening". Eventually they fall out of the tree, get thrown out of the car, and it disappears into the forbidden forest. A few scenes later, Ron is trying to repair his wand with cellotape in the great hall. But at what point did he actually get his wand back? It wasn't in his hand when he was thrown out of the car, he was in too much of a panic to get it whilst in the car, and he certainly didn't venture into the forbidden forest to retrieve it afterwards. [The car expelled them and everything that was theirs before driving off.]

In the Scene where Vernon tells everyone what to do when the Masons arrive. When he says "And Pertunia, you will be..." you can see Vernon mouth the words when Pertunia says "I'll be in the lounge, waiting to welcome them graciously into our home." [Vernon has carefully coached them on what to say to the clients and is making sure that Petunia gets it exactly right.]

In the scene where Dobby talks to Harry in the infirmary, Dobby says he has ironed his hands and shows them bandaged. A few shots later the bandages are gone, and then in the next shot they are back. [The bandages are still there; it's just difficult to see in the dark.]

If Mr. and Mrs. Weasley are so concerned that the kids will miss the train at 11:00 since they didn't arrive at King's Cross until 10:58, why wouldn't they allow Ron and Harry to go through the platform before they do? Wouldn't they have tried to get them through first so they could get on the train? [I think we're supposed to assume that they're so anxious about Ginny on her first day that they rush through with her and leave the boys to follow - which normally they could have done with no problems, except that Dobby was magically blocking the entrance.]

Why would Gilderoy Lockhart use Ron's wand to cast a memory charm on Harry, the spell that backfires on him? Even if Ron's wand was intact, any wizard knows that the wand chooses the wizard not the other way around, and if you remember from the first movie, Harry caused quite a bit of destruction trying out wands that weren't made for him. Surely Lockhart shouldn't expect someone else's wand to work for him. [Other people's wands don't actually cause destruction in the books - this was just amped up a bit in the initial 'choosing a wand' process for the films. Mr Ollivander, the wandmaker, explains to Harry simply that 'you will never get such good results with another wizard's wand'. The spell only backfires in Lockhart's case because Ron's wand was broken.]

When Harry, Ron and Hermione made the Polyjuice potion so they could get into the Slytherin house, Harry and Ron made the sleeping draught potion in the cupcakes for Crabbe and Goyle so they could lock them away and not risk running into them in the house. Hermione was going to turn herself into a Slytherin named Millicent Bulstrode before the spell went wrong, but she hadn't taken any precautions like a spell to not see her in the house. What if she ran into Millicent in the Slytherin house looking like her? [In the book we are told that Millicent Bulstrode has gone home for the holidays at the last minute, so that's why Hermione doesn't need to be as careful. Of course, this raises new concerns - what would the Slytherins think if she suddenly turned up again? - but that's a book issue, not a movie mistake.]

In the scene where Harry falls out of the car when they are trying to get away from the train you can see that Harry's hair is blowing in the wind. When Ron goes to grab Harry and pull him in Ron's hair does too, then when he goes back in the car his hair is still blowing even though he is in the car with the windows up. [The two front windows are in fact down. They are down even before Harry falls out of the car, which can easily be seen while they're flying over the tracks (notice their hair waving in the breeze).]

When Harry and Ron go and visit Hermione in the hostpital wing, Harry is holding her hand and by the look of it, he had been for a few minutes. Then he discovers the piece of paper in her hand. Wouldn't he have felt that earlier? [At the very beginning of this particular scene, we see Harry exchanging some dead flowers with some fresh flowers, in a vase next to Hermione's bed. He then goes and sits down on the bed and says "wish you were here Hermione, we need you now, more than ever". At THIS point, he puts his hand on hers and finds the piece of paper. He had only just put his hand on hers when he found it.]

When Harry drops the polyjuice potion, you see that it lands on a grate. When Myrtle floods the washroom, wouldn't the water go into these grates? [No, there could have been too much water for the grates to have drained all the water on the floor causing the water to spread. Also, the floor might not have been even or had flooded too far away from the grates so that the water could have created a puddle and could not run back to the grates.]

When Harry is writing to Tom Riddle through the diary there is a close up of Harry's face and in the reflection of his glasses you can clearly see the film crew. You are able to see the camera-man and a women standing next to him, and they are moving around. [You can't see anyone in his glasses because there wasn't any glass in the frames for the majority of the film.]

While the rocks are falling between Harry and Ron, Harry falls on his stomach and you can see several boulders bounce off of his back. [The boulders do not hit Harry, they fly over his back.]