Factual error: When Harry talks to the snake, the camera shows a close up of the snake, and it blinks. Snakes don't blink because they lack eyelids. (00:06:50)
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! (00:31:55)
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. (00:13:35)
Factual error: The first film takes place from 1991-1992 (the seventh film shows James and Lily's grave, with the correct dates to have the film take place in 1991), however when Harry asks to borrow Ron's Daily Prophet during the first mail delivery, the date at the top reads 2001. (00:52:30)
Chosen answer: There are several reasons. First, the position is cursed, so there is little reason to give Snape the job when he will not last any longer than all the previous instructors. If Snape did become the DADA instructor, something could happen to him that could result in his being harmed, having to leave Hogwarts, or be otherwise incapacitated in some way; that would render him useless to Dumbledore as a double agent. Also, Dumbledore trusts Snape, but putting him in an environment where he is teaching about dark magic on a daily basis would be too tempting and emotionally compromising to someone who had been so easily seduced by the dark side. He could possibly relapse. It would be like having a recovering alcoholic work as a bartender. Of course, he does eventually become the DADA instructor, and lasted no longer than his predecessors.
raywest ★
In the movies it is never mentioned that DADA role was cursed by Voldemort.
This is true; though it doesn't say it's not either. With trying to fit 7 long books and years worth of pages of HP information in 2 and a half hours; as long as the movie doesn't say it's not cursed, with our knowledge, there is no problem with reporting that it is. Even directors of non-book movies do this all the time; leave background information out that helps explain things they just didn't have time so they explained it behind the scenes.