9 details you missed in 'Harry Potter and the Prisoner of Azkaban'

In the Leaky Cauldron, a wizard can be seen using magic to make a cup stir itself. While he does this neat trick, he reads Stephen Hawking's "A Brief History of Time."

It's curious to see a wizard reading a muggle book like this, although we don't know for sure if Hawking is a muggle or not.

What's more, this wizard is actually played by former Stone Roses frontman Ian Brown, who is a friend of director Alfonso Cuarón in real life.

During the Leaky Cauldron scene, we can see a waiter wipe down a table. With a wave of his hand, the chairs move on top of the tables.

But what's even more magical is that the wizard wipes down the table with a cloth and then folds the cloth over an empty wine bottle and — poof — the bottle vanishes completely. It's little moments like these, like the ice-skating snowman in "Order of the Phoenix," that make the magic of the Wizarding World feel so real.

The Hogwarts choir and their overgrown toads are a nice addition to the movie upon Harry's return to Hogwarts. They are conducted by Filius Flitwick, but one line of their choir sticks out more than most.

"Double, double, toil, trouble" is actually a line taken from the witches' dialogue in Shakespeare's "Macbeth."

Buckbeak the Hippogriff is one of the nicer magical creatures in the movies, even if it did break Draco's arm.

We first meet Buckbeak in Hagrid's inaugural care of magical creatures lesson, and the filmmakers wanted the Hippogriff to be as naturalistic as possible. This included having the creature act as similar real-life creatures would — and to add to this sense of realness, the filmmakers decided to show Buckbeak defecating onscreen as a horse would.

You can see this just as Harry first approaches Buckbeak:

Honeydukes is one of the most fun-looking places in the "Harry Potter" universe, and we first see it when Harry sneaks through the sweet shop and into Hogsmeade village while wearing the invisibility cloak.

As he walks through the shop, we can see a skeleton on display in a cabinet — and it seems to be decorated in a very similar style to the Day of the Dead skeletons often seen in the Mexican holiday, only with added candy.

This could be a reference to director Cuarón's Mexican heritage.

In the scene where Snape takes over Defence Against the Dark Arts from an absent Lupin, Draco takes delight in sending an enchanted piece of parchment with an animated drawing on it to Harry.

The drawing is of Harry getting hit with a bludger and struck by lightning during an upcoming quidditch match, but you may not notice that Draco was apparently so proud of his artistry that he actually took the time to sign it in the bottom left-hand corner.

In a classic "Harry Potter" hidden detail, Newt Scamander makes a surprise cameo on the Marauder's Map.

After he is given Fred and George's enchanted parchment, Harry closes the map by saying, "mischief managed." But just before he does, you catch a glimpse of the Hogwarts castle and its occupants. If you pause the movie and look closely, you can see Newt Scamander's name on the map.

Scamander would later be played onscreen by Eddie Redmayne in 2016's "Fantastic Beasts and Where to Find Them" and its 2018 sequel "The Crime of Grindelwald." It's unclear whether this appearance in Hogwarts is canon or not.

While we may not see a crew member themselves, we do catch another glimpse of the movie-making process in this scene where Harry and Hermione try to free Buckbeak after having time-traveled using Hermione's time turner.

If you look closely, when Harry has his back to the camera, you can see the microphone pack attacked to Radcliffe's waistband. It's actually a pretty noticeable lump once you see it.

The Marauder's Map features another surprise in this movie, too — this time during the end credits.

As the credits roll and we see characters popping in and out of the map, we can see two pairs of feet in the corner of the map. The way they are positioned — squished together and opposite each other — would suggest that the pair are actually getting rather intimate with one another.