Question: I get that the DADA role is cursed because of Voldemort being denied the role when he applied for it at Hogwarts, but why does Dumbledore not let Snape take the role like he's wanted to every year? I thought Snape was a double agent (he spies on the Death Eaters and Voldemort for Dumbledore, and he pretends to be on Voldemort's side too), so unless Voldemort decides that he wants to get rid of him for being in the role, he's okay to take it on provided he's given it, and yet every year, Dumbledore turns down his application. Is it because Snape's too involved in Voldemort's side of things or some other reason? I hope I explained it well.
Question: How did Dudley get out of the snake exhibit after falling in?
Question: What ever made Snape suspicious of Quirrell? He couldn't have known that Voldemort was attached to Quirrell, or even that Quirrell supported Voldemort, because he surely would have reported either detail to Dumbledore. Then Dumbledore would have stopped Quirrell. So it isn't clear why he guessed, correctly, that Quirrell let the troll into the school or tried to kill Harry during the Quidditch game.
Question: How did Argus Filch get a job at Hogwarts? Even though his father was a wizard, he had no magical abilities. Wouldn't that have made it impossible for him to even go to Hogwarts?
Question: If Snape never wanted the Philosopher's stone, why did he attempt to enter the chamber on Halloween (when Fluffy injured his leg)? Quirrell later says that Snape stopped him from trying to get the stone on Halloween, so there should have been no reason for Snape to try and get past Fluffy.
Question: The Hogwarts letter states that the recipient has been "accepted" into the school, so are there other magical schools for those who aren't chosen for Hogwarts?
Question: What would happen if two or more houses won the House Cup? Would there be some kind of contest to decide who should get it or would the houses share it?
Question: If Dumbledore wanted to take the Philosopher's Stone and hide it at Hogwarts in order to lure Voldemort out (as answered in another question), isn't that taking a huge risk in regards to Harry's safety? Dumbledore knows Harry is starting that year and also that Voldemort wants to eliminate Harry, so isn't he potentially putting Harry at risk by attempting to lure Voldemort to Hogwarts (to get the stone). I mean after Harry defeats Quirrell/ Voldemort in the chamber and Dumbledore visits him in the hospital wing, he doesn't even apologise for risking Harry's life by moving the stone from Gringotts to Hogwarts.
Question: Near the beginning of the movie, how could the first-year students' luggage have been brought to their dormitories if it wasn't yet known what houses they would be in?
Question: As pointed out in another question, most Muggles would be surprised to find out about the wizarding world. Surely some of them would think that their child's Hogwarts letter was a joke or something. So do all Muggles with Muggle-born magic children know where the children are going?