To get to Diagon Alley, you have to pass through a street in Muggle London. Step into the classic red phone booth and dial the word "MAGIC" (62442) to access a message straight from the Ministry of Magic itself.

While you're in Muggle London, try asking the employees of King's Cross Station for directions to Platform 9 and 3/4. They'll look at you like you're off your rocker.

If you purchase an interactive wand at the park, you'll be given a map of magical locations where your wand can actually cause "magic" to happen. The Knockturn Alley section of the map can only be read if you place it under a black light (luckily, you can find plenty of black lights in the depths of Knockturn Alley).

It's hard to miss that big ol' dragon. But if you're looking for a fantastic beast that's a little more subtle, check out the second level of the Magical Menagerie store, where you can spot Luna Lovegood's legendary Crumple-Horned Snorkack.

Also at the Magical Menagerie, there's a snake in the window that will speak to you in both Parseltongue and English.

Take a moment to look in the upstairs windows at Sirius Black's dismal London residence. You can spot Kreacher the house elf peaking out through the window of 12 Grimmauld Place every so often.

If you take a moment to use the public restrooms in the charming town of Hogsmeade, you're going to want to listen closely for everyone's favorite sadgirl ghost weeping from a bathroom stall.

While in Diagon Alley, you can exchange your pitiful muggle money for some wizard currency at the Gringotts Money Exchange. Try asking the animatronic goblin if he's a house elf, and see if he appreciates your question.

If you know your Hogwarts house, be sure to find a cast member wearing your house colors and ask them to teach your the secret house handshake. If you don't know your Hogwarts house, there are sorting hats for sale that'll sort that out for you straightaway.

While you're slamming a butterbeer at the Three Broomsticks, keep an eye out for the shadows of house elves bustling about behind the scenes.

While you're trying on your wizarding robes at Madame Maulkin's, be sure to check yourself out in the mirror. The mirror while likely comment on your appearance (fair warning that it's not always complimentary).

Listen closely to the Vanishing Cabinet at Borgin and Burkes, and you'll hear a trapped bird chirping inside. The very same bird that Malfoy used to test whether or not he could sneak Death Eaters into Hogwarts.

There used to be a Jaws attraction where Diagon Alley now stands in Universal Studios. If you look very closely, you can see that the Muggle record shop sells the hit song "Here’s to Swimmin’ with Bow Legged Women," a direct quote from the movie Jaws. You can also buy shark teeth at the apothecary.

Walk right up to The Monster Book of Monsters in Dervish and Banges and see what happens. Don't worry, it can't actually bite you... I think.

There are a ton of Easter eggs along the line for The Forbidden Journey ride at Hogwarts. Be sure to stop by and listen at the potions classroom door, to hear poor Neville getting a lecture on how to properly cast a spell.

Watch out — the sign at the Leaky Cauldron in Diagon Alley will actually leak on you if you're not careful.

Hang around The Owl Post for long enough, and you'll hear a howler explode at some unfortunate soul.

The ad in King's Cross Station is the very same one from the film Harry Potter and the Half Blood Prince. It's right on the way to Platform 9 and 3/4 (where, by the way, you'll be able to watch yourself disappearing into the wall, as if by magic).

Or actually, do mention Voldemort to one of the cast members in Diagon Alley or Hogsmeade and see what happens. They'll be quick to remind you that such a name is not to be spoken aloud.