The movies about Harry Potter took some liberties in adapting the books. However, there was one thing that the filmmakers were inconsistent about, breaking their own rule. This led to a logical error.
A really cool thing from the world of Harry Potter is the Polyjuice Potion. It allows a person to transform into someone else. All that is needed besides the recipe and the ingredients is a hair from the person you want to turn into – and a lot of time.
In Harry Potter and the Chamber of Secrets, Hermione prepares this potion, with which Harry and Ron then transform into Draco Malfoy’s friends Crabbe and Goyle. In doing so, the filmmakers changed an important detail regarding the effect of the potion.
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The perfect disguise also requires the voice
Attention: There follows a spoiler for Harry Potter and the Goblet of Fire.
What detail is being referred to? In the books, the Polyjuice Potion changes the appearance and also the voice of the person who drinks it. However, this was changed for the films. Harry and Ron still have their own voice after drinking it. When they meet Malfoy, played by top-earner Tom Felton, in their transformed state, they have to make an effort to sound like his friends.
Now, this change wouldn’t be that bad and could simply be accepted. After all, it provides some funny moments in the film. However, the change is inverted just two movies later.
In Harry Potter and the Goblet of Fire, the character Barty Crouch Jr. consumes the potion for the entire time he spends at Hogwarts. With this, he obscures his true form and disguises himself as Professor Moody. Strangely, Crouch Jr. looks not only like Moody, but he also sounds just like him.
At this point, an exception was made, and it was decided that the Polyjuice Potion also changes the voice. The reason for this may have been that they wanted to save the twist of who is really behind Moody for the end.
Was this rule maintained? No, it wasn’t. In The Deathly Hallows – Part 1, members of the Order of the Phoenix transform into Harry himself using this potion. It results in a funny scene where everyone speaks in their real voice but looks like Harry.
This shows that the filmmakers were not in agreement about which rule applies. In the end, this leads to some chaos from a logical perspective. Given that the potion plays a prominent role in some important scenes, perhaps an explanation was warranted. Another blockbuster is also struggling with a problem: Jurassic Park has a logical error that still frustrates scientists today
