The Great Hall Detail That Makes No Sense In The Harry Potter Movies

The Great Hall's perplexities begin with one of its simplest, yet most central elements: the tables. Specifically, how the tables are always the perfect size for the number of students in every house. Even if the tables magically grew and shrunk to fit the correct number, the size of the room still limits their maximum length.

They don't share tables, either. Students often wear their house colors during Hall scenes, and they tend to sit with their housemates, at least on special occasions. So, it can be assumed that during feasts everyone is supposed to sit at their house's table. At the end of the day, the room has to be built with that in mind.

But Hogwarts doesn't determine the number of students in every house. It depends on the student's individual personality. They can't predict the ratio of Hufflepuffs to Slytherins. What if there are more Slytherins than the whole room could house on one long table? Does the room magically get bigger? It's a complete miracle that everyone is seated so comfortably every year with no interruption. This is doubly true whenever they have guests. There was no explanation for where the guest schools sat during Goblet of Fire's Triwizard Tournament.