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Harry Potter and the Philosopher's Stone (2001) - 221 mistakes
A very important point. It's only "Sorcerer's" for the US release, so please don't tell me I've got the title wrong, as it's "Philosopher's" in almost every other country. Also, please don't submit ANY book/film discrepancies - there's nothing major, and what trivial ones there are don't count as "movie mistakes".
Factual error: The Hogwarts Express leaves from platform nine and three-quarters, between platforms nine and ten at King's Cross station, London. The platforms shown in the film as nine and ten are, in fact, four and five (the only platforms that have a wall between them as shown in the film). The real platforms nine and ten are in a separate part of the real station. In addition, when Hagrid and Harry are on the footbridge, they are walking towards platform one, away from both the real platforms 9 & 10 and the film's platforms 9 & 10. No wonder Harry feels lost when Hagrid leaves him to find the train on his own!
Continuity: The first wand Ollivander gives to Harry has a long slim handle with 5 or so grooves carved at the wand end. When Harry puts the wand down, the grooves are even with the binding of the book lying there. When Ollivander hands Harry the second wand, look to the left by the book and you can see that not only has the wand been moved, it is actually a different wand with a shorter, wider handle and only one groove at the wand end.
Continuity: When Harry, Ron and Hermione are in the lavatory with the troll, the scattered wood pieces of the damaged cubicles change positions in consecutive shots throughout. For example, just before and after the troll drops Harry, in the close-ups of Harry the wood differs from the consecutive overhead shots.
Continuity: When Harry and Hagrid arrive in London and are speaking about what Harry needs to buy, the shot of them walking towards the camera has a block of three shops on their right. I cannot make out what the first one they pass is. The second is a cafe, and has the street no. 35 above it. The one nearest to the camera is a fruiterer/greengrocer ? numbered 33. Hagrid and Harry pass the first shop, and are outside the café. The shot cuts to Hagrid and he passes buildings with the numbers 45 and 44 on them (strange if the odd numbers are on the other side of the street). His head is just about to pass the no. 44 (maybe two steps more and he would pass it). We then cut back to Harry, who is walking past a wine shop ? not one of the three shops above. When we cut back to the shot of Hagrid, (after he has taken a few steps from the previous shot of him) his head is just about to pass the 44.
Continuity: When Harry is on his way to the restricted section of the library under his Invisibility Cloak, we see a shot of his hand holding the lantern (the first shot in the scene). You can see the end of his jumper. In the next shot, however, the end of his jumper is under the cloak, and it had no time to get there between shots.
Continuity: At the beginning, Dumbledore is taking out all of the street lights, from one shot, the street light closest to Dumbledore on HIS right is still lit, but in the next shot, which is a close up of him taking the light, and shots later, the street light is out and he never "took" the light from that one.
Factual error: When Hagrid visits the Dursley family in the hut on the rock, Hagrid grabs and bends the shotgun barrel while it is still being held by Mr. Dursley. This is impossible. The gun is made of strong metal, and when Hagrid grabs it, it starts bending, while still in Dursley's grip. Seeing as how Hagrid (the half Giant) is very strong, he should either knock Dursley to the floor or pull the gun straight out of his hands (and maybe his arms with it), if Dursley were to really keep hold of the gun as it is bending. Mr. Dursley must have one strong grip.
Continuity: In the scene where Ron and Harry are on the train to Hogwarts, the window to the compartment is open. We know this because the chocolate frog jumps out the window and is swept away by a pretty strong wind. Since the window is indeed open, shouldn't there be a visible breeze thoughout the compartment?
Continuity: On Dudley's birthday, when Mrs Dursley wakes Harry and he sits up in bed, a cloth and hand brush are hanging next to him on the inside of the cupboard door. When Dudley shoves Harry back into the cupboard, there is now a cloth and a dustpan, but no brush. When the family arrive back from the zoo, and Mr Dursley locks Harry in the cupboard, there is no cloth, brush or dustpan.