Harry Potter and the Prisoner of Azkaban is the third movie in the beloved magical franchise, but in many ways, it was a film of firsts. It was the first Potter not directed by Chris Columbus (Alfonso Cuaron served as his replacement) and it was also the first Potter released in IMAX. Those are just a couple of the facts featured in the newest episode of You Think You Know Movies!

Prisoner of Azkaban also marked the first performance by Michael Gambon as Hogwarts headmaster Albus Dumbledore, following the death of the original Dumbledore, Richard Harris, in 2002. (Other actors considered for the part included Peter O’Toole and Ian McKellan.) Although it’s beloved among Potter fans, the movie wasn’t as big of a hit as some of the other films; in fact out of the eight Potter films in the series, Prisoner of Azkaban has the lowest worldwide gross, with $796 million worldwide.

‘You Think You Know Movies?’ is a ScreenCrush original series that dives deep into the cinematic worlds of your favorite movies and freeze frames a few tidbits you might not have known. We’ve already tackled Star Wars, The Avengers and Spider-Man, but now it’s time to bone up on those magic spells with some Prisoner of Azkaban facts. Watch more installments of ‘You Think You Know Movies?’ below and let us know in the comments what movies we should cover next.