History Trivia / HarryPotterAndThePhilosophersStone

** They couldn't afford to build every room in Hogwarts at the studio because this was the first movie and everything was being created from scratch. Therefore, certain parts of Hogwarts are represented by real-life locations throughout Britain. In reality, the entrance hall and the library are in Oxford, the corridor outside the Gryffindor common room is in Gloucester Cathedral, [=McGonagall's=] classroom is in Durham Cathedral, various classrooms and hallways are in Lacock Abbey, Madam Hooch's flying lesson is at Alnwick Castle, and Flitwick's classroom is in Harrow School. Many of these locations recurred in the second movie, but from the third movie onwards, the Hogwarts interiors were mostly shot in the studio.

** In the theatrical trailer, Dumbledore's welcome speech includes the line, "no magic is to be used between the classes in the corridors," which is omitted in the final film.

** While the King's Cross scenes were filmed at the real King's Cross, platforms nine and ten in the film are actually platforms four and five in real life. This is because the real platforms nine and ten don't match the description in the book. Creator/JKRowling has admitted that she made an error and was thinking of Euston Station when she wrote the scene in the book. Creator/StuartCraig also cited the additional reason that shooting at platforms four and five allowed them to showcase the station's Victorian architecture whereas platforms nine and ten look more modern in reality.

** While the King's Cross scenes were filmed at the real King's Cross, platforms nine and ten in the film are actually platforms four and five in real life. This is because the real platforms nine and ten don't match the description in the book. Creator/JKRowling has admitted that she made an error and was thinking of Euston Station when she wrote the scene in the book.

** In an extremely minor case of this, platforms nine and ten at King's Cross were filmed at the real platforms four and five.

** Allan Corduner voices Snape, Flitwick, and Filch.

** They couldn't afford to build every room in Hogwarts in the studio because this was the first movie and everything was being created from scratch. Therefore, certain parts of Hogwarts are represented by real-life locations throughout Britain. In reality, the entrance hall and the library are in Oxford, the corridor outside the Gryffindor common room is in Gloucester Cathedral, [=McGonagall's=] classroom is in Durham Cathedral, various classrooms and hallways are in Lacock Abbey, Madam Hooch's flying lesson is at Alnwick Castle, and Flitwick's classroom is in Harrow School. Many of these locations recurred in the second movie, but from the third movie onwards, the Hogwarts interiors were mostly shot in the studio.

** Outside of Hogwarts, the Privet Drive exteriors are Picket Post Close, the Gringotts lobby is London's Australia House, and the Hogsmeade station is Goathland railway station. All three of these filming locations were used only in the first movie, and when the in-universe locations showed up in subsequent films, they were recreated at the studio.

* CaliforniaDoubling: They couldn't afford to build every room in Hogwarts in the studio because this was the first movie and everything was being created from scratch. Therefore, certain parts of Hogwarts are represented by real-life locations throughout Britain. In reality, the entrance hall and the library are in Oxford, the corridor outside the Gryffindor common room is in Gloucester Cathedral, [=McGonagall's=] classroom is in Durham Cathedral, various classrooms and hallways are in Lacock Abbey, Madam Hooch's flying lesson is at Alnwick Castle, and Flitwick's classroom is in Harrow School. Many of these locations recurred in the second movie, but from the third movie onwards, the Hogwarts interiors were mostly shot in the studio.

*** Neville suffers the effects of the Leg-Locker Curse, and Harry finds Nicolas Flamel's name on the back of Dumbledore's Chocolate Frog card.

*** An expanded version of the Potions class, with Snape revealing the answers to his questions and taking five points from Gryffindor.

* WhatCouldHaveBeen: See [[WhatCouldHaveBeen/HarryPotterAndThePhilosophersStone page]].

* WhatCouldHaveBeen: See [[WhatCouldHaveBeen/HarryPotterAndThePhilosophersStone page]].

* FakeBrit: Defied by Creator/JKRowling, who insisted all cast members be British or Irish. The exceptions are Eleanor Columbus's non-speaking role as Susan Bones (the first girl to get sorted), and Verne Troyer (Griphook) who was dubbed by Creator/WarwickDavis. Creator/ZoeWanamaker (Madame Hooch) was born in New York but raised in the UK as her father, actor Sam Wanamaker, fled the U.S. to escape UsefulNotes/TheHollywoodBlacklist.

* AwesomeDearBoy: Harry Melling absolutely loved playing Dudley, saying how much fun it was to play a shameless {{spoiled brat}}.

* WhatCouldHaveBeen: See [[WhatCouldHaveBeen/HarryPotter subpage]].

* WhatCouldHaveBeen: See [[WhatCouldHaveBeen/HarryPotter subpage]].

* AbilityOverAppearance: Creator/JKRowling has said that she felt Creator/EmmaWatson was perfect for Hermione after speaking to her on the phone -- where in true Hermione fashion she spoke for sixty seconds without taking a breath. She's joked that if she had met Emma before and seen [[AdaptationalAttractiveness how pretty she was]], she may not have been cast.
* ActingForTwo: Ian Hart played Quirrell and provided the voice and motion capture for Voldemort. (Richard Bremmer was not the voice, he portrayed Voldemort in the flashback to the death of Harry's parents.)
* AwesomeDearBoy: Harry Melling absolutely loved playing Dudley, saying how much fun it was to play a shameless {{spoiled brat}}.
* BeamMeUpScotty: "Yer a wizard Harry" is only in the film. In the book, Hagrid says "Harry -- yer a wizard."

* DummiedOut:
** The first PC game was to feature a spell [Flintifors] for turning small objects into matchboxes. If you happen to come across the Transfiguration classroom in ''Chamber of Secrets'', [=McGonagall=] briefly mentions this spell[[note]]In this case, ''Flintifore''[[/note]].
** In the PC version, you were supposed to learn Avifors and Verdimillious, like in the [=PS1=] and in the former's case, 6th generation console versions, but both were cut out.

* OldShame:
** Creator/JKRowling regrets caving to Scholastic and letting them Americanize the book's title and text for the U.S. market. She made sure to assert herself and keep everything unchanged for the American releases of future instalments.
** Creator/DanielRadcliffe, Creator/RupertGrint and Creator/EmmaWatson all have said they have a hard time watching themselves in this film (along with the second) as they feel their performances were not up to par with their work in the later films. Watson is particularly embarrassed over the fact that she can be seen mouthing the other actors' lines in a few shots.

* WhatCouldHaveBeen: See [[WhatCouldHaveBeen/HarryPotter subpage]].

* WordOfGod: Due to the books' covers showing Harry with a scar in the middle of his forehead, most fans assumed this is where his scar was meant to be. However Creator/JKRowling insisted on having it on the side of his forehead, the books never specifying where exactly the scar was.

** After the dragon hatches, Harry mentions that Hagrid had said he wanted a dragon "more than anything" when they first met. This references a scene from the book, which had been filmed but was ultimately cut.

* LoopingLines: Towards the end of filming, Creator/DanielRadcliffe's voice cracked, necessitating a soundalike dub his final lines in the film.

* FakeBrit: Defied by Creator/JKRowling, who insisted all cast members be British or Irish. The exceptions are Eleanor Columbus's non-speaking role as Susan Bones (the first girl to get sorted), and Verne Troyer (Griphook) who was dubbed by Creator/WarwickDavis. Creator/ZoeWanamaker (Madame Hooch) was born in New York as her father, actor Sam Wanamaker, fled the U.S. to escape UsefulNotes/TheHollywoodBlacklist, but she was raised in the UK.

* DuellingMovies: The film came out one month before the movie version of ''Film/TheLordOfTheRingsTheFellowshipOfTheRing''. Both managed to be massive box office successes, and the duel would be repeated twelve months later with their respective sequels.

* ImageSource:
** DistinguishingMark
** FatBastard
** FireForgedFriends (fan art)

* QuoteSource:
** FireForgedFriends
** SkewedPriorities

** Creator/ChrisColumbus expressed regret over the visual effects in the film, saying they weren't very good. When it came time to make ''Chamber of Secrets'', he made sure to film all of the scenes requiring effects first so the effects team would have more time to work on them.