On set, the house-elf Dobby was nothing more than an orange ball on a stick . Actors had to interact with this placeholder before the character was digitally added in post-production.
In scenes where the students are shown doing homework in the Great Hall or classrooms, the actors were often doing their actual real-life school assignments to make the environment feel more authentic.
Explore more about the production challenges and secrets of the second film:
This is the only Harry Potter film with a post-credits scene. It reveals a moving book cover in a Diagon Alley window showing a confused Gilderoy Lockhart in a straitjacket, titled "Who Am I?" .
You can spot the opal necklace —which plays a major role years later in The Half-Blood Prince —inside a display case in Borgin and Burkes when Harry first accidentally enters Knockturn Alley.
Rupert Grint (Ron Weasley) has a severe, real-life fear of spiders. In the scene with Aragog, his terrified expressions and squirming weren't acting—he was genuinely frightened and still hasn't watched the full scene.
Shirley Henderson, who played Moaning Myrtle , was 37 years old during filming. This makes her the oldest actress to ever portray a Hogwarts student in the franchise.
