Revealing mistake: In the scene where Harry and co. are in the Room of Requirement, at several points during this scene, you can tell by the way the light shines that Harry's glasses are missing their lenses, especially in close up shots of Harry.
Revealing mistake: When Lupin is on the castle bridge and reunites with his wife-right after the scene where Neville beckons the dark wizards that disintegrate in the force-field-if you carefully watch the right hand corner of the screen, a very obvious green screen error can be seen in the castle window.
Revealing mistake: When Gregory falls in the fire and dies, while he is falling, you can very obviously tell that it's a stunt double who looks nothing like Josh Herdman.
Answer: Yes. According to J.K. Rowling in interviews, the curse Voldemort had cast on the Defense Against the Dark Arts position preventing any teacher lasting more than one year, was finally broken upon his death, and from then on any instructor lasted beyond twelve months.
raywest ★
In the movies it is never mentioned that Voldemort cursed the DADA post or even applied for this position.
It is mentioned in the books.