Harry Potter and the Prisoner of Azkaban (film)/Fridge

Fridge Brilliance

 * This film is chock-full of these to make up for its Adaptation Decay and Narm. Several moments in the film foreshadow things that will happen later in the series:
 * Harry's number in the Quidditch game - his shirt says "POTTER 7". Harry eventually turns out to be Voldemort's seventh horcrux.
 * Harry sees Sirius's face in a crystal ball calling his name. Sirius is the reason Harry finally hears the prophecy.
 * When Harry is coming to after his Quidditch accident you can hear one of the twins say "Let's throw you off the Astronomy tower and see how you look", a rather dry joke about another character who later gets thrown off the Astronomy Tower.
 * This is actually more of a Funny Aneurysm than Fridge Brilliance as the PoA movie came out a year before HBP was released.
 * Unless Rowling let something slip. Months before Deathly Hallows was even finished, she accidentally let the fact that Dumbledore would play a significant role in that book slip to the cast on the set.
 * Rowling herself mentions the 'accidental' foreshadowing in one of the interviews on the DVD. Cue crazed fans scrutinizing the movie.
 * When Lupin and Harry discuss Harry's parents Lupin mentions that Lily had a gift for seeing the good in everyone, "even when that person could not see it in themselves". Initially we assume he's talking about himself but he had three best friends and amazing adventures with them, he felt great. He was really talking about Snape whose only real friend was Lily.
 * Interesting theory, but there's no evidence to suggest that Lupin ever realized that Lily did see good in Snape. If he had, he would have trusted him more.
 * Lupin was describing his own friendship with Lily, but his description also describes her friendship with Snape as well.
 * Snape shields Harry, Ron and Hermione from the werewolf Lupin when he attacks, foreshadowing his true allegiance.
 * Ron and Hermione's future relationship is foreshadowed such as when she grabs his hand during the Care of Magical Creatures class and when she turns to him for comfort after she thinks Buckbeak has been killed.
 * In the third film, despite the choir singing an ominous Shakespeare verse, among other dark aesthetics, the film ends on a rather happy note. Many found this strange, until they realized that the events of the film set the stage for the return of Voldemort in the next one. -dmeagher101
 * One small moment in this movie seems to hint at Snape's true allegiance, something which Rowling did not reveal until the seventh and final book. The moment comes after the characters have emerged from the Whomping Willow. Snape regains consciousness without realizing that Lupin has turned into a werewolf. As soon as he sees the werewolf, a look of terror shoots across his face, and he immediately spreads out his arms to shield the children from the werewolf. It's hard to believe he'd do that—not only a very brave act, but one that looks instinctive—if he was loyal to Voldemort.