I have read of a few things here and there on other sites, but I haven't made it back to find them myself yet.
Twister - In the second preshow, watch the spinning tractor wheel in the ceiling. When it stops, you should notice there are a pair of Mouse Ears attached to it.
Shrek 4D - In the gift shop there is a decorated stairway. This was once the "Vertigo" stairway from the attraction that once occupied the building: Alfred Hitchcock, the Art of Making Movies.
Revenge of the Mummy -
*KONGfrontation, the building's former attraction, managed to leave several references in the Mummy ride. In the queue, keep your eyes peeled for several bananas scattered about.
*There are also some large gorilla hyeroglyphics near the giant Anubis figure.
*As you wind through the dark corridors at the beginning of the ride, look closely at the people from the crashed train. One of them is wearing a hat that says "Kong Rules".
*In the Treasure Room scene, wait for the treasure to light up, then quickly look to your left, near the middle of the piles. You should see a golden statue of King Kong himself.
*There are ride vehicles hidden in the dark Coaster portion of the ride, including some E.T. Bikes. When the lights flash revealing the mummies, look quick and you might spot them.
*There is a small rectangular chamber in the tomb portion of the queue. To the right as you enter there is a hole with treasure. Try to grab it.
Jaws - In the queue line for Jaws, keep your eyes open for shoes hanging about. Each one represents a skipper of the ride's past.
Men in Black -
*In the queue, take a look at some of the posters hanging about the walls. Do they look familiar? They should. They were deliberately designed to look like the classic
Disneyland posters.
*If you are on the right track, you'll have a chance to shoot Steven Spielburg. After the Ambush, you'll see "Steven" sitting on a bench reading a newspaper.
*The newspaper the Steven Spielburg is reading features Jurassic Park 3.
*Listen for your instructor to shout "Push the red button!" at the Big Bug scene. That's your cue to, well, push the red button in front of you. If you do, you'll recieve a 100,000 point bonus.
Port of Entry -
*Almost every Port of Entry building has a conversation going on inside. Listen closely. In one building you might hear an arguement; in another, you might hear a lively conversation.
*Check out the Port of Entry Firestation, unfortunately closed. Why's it closed? The sign reads "Moved closer to water".
*There's an actual mailbox in the Port of Entry. It reads RocketMail and is emptied once a week. You can buy stamps in the Islands of Adventure Trading Company.
Marvel Super Hero Island - There are two sets of "Newscast Machines" in the area. One is near Storm Force, the other on the terrace of Captain America Diner. Press each machine's buttons to hear an interesting news update.
Dr. Doom's Fearfall - Outside of the ride entrance, look carefully at the concrete. There are body imprints from those who have fallen from atop the tower.
Toon Lagoon -
*Next to Me Ship, The Olive play area, there's a quiet little secluded path way that goes over the water. On it you can find: A school of fish, an anchor on shore (being held in place by a boat), Plymouth Rock, crow's nest, and perhaps more sight gags.
*There's a big plate of burgers providing a fun photo op on one of the tables outside Wimpy's.
*Outside Dudley Do Right's Ripsaw Falls, keep an eye on the Dynamite Shack. Every time a log flies through it, not only are their numerous sound effects and creaking boards, a chicken pops out of a crate.
*There's a giant bomb in front of one of the Toon Lagoon shops. Push down on the trigger.
*Look for the hidden Aesop and Son photo op in a small alleyway on Comic Strip Lane.
*Be sure to spot the Fountain of Toon Dogs, with dogs from many classic cartoons.
*Follow the Family Circus dotted line to find Billy.
Me Ship, The Olive -
*As you enter the boat, turn left. There should be a box on the floor. Get down and look closer, maybe touch it a little. A Popeye character will appear inside.
*On the first floor of the ship go up to the cargo nets, right where they start. Hop on it and look down. There's a hole in the ship! Not only that, but there are sharks below! (Be sure to not drop any loose and small personal belongs here!!)
*On the second floor you may find a kid-sized player piano. On the music sheet the color-coded notes play the tune of Popeye. Play them correctly and the entire song will play.
Dudley Do Right's Ripsaw Falls -
Warning: Numerous Disney Spoofs ahead!!
*In the queue, in the room before the loading room, there are two talking animal heads. The beaver and bear converse making cheap puns as you wait. Listen carefully for them to take a jab at both "it's a small world" and the "Country Bear Jamboree".
*Also in the queue, keep your eyes open for movie posters advertising such classics as "Paws".
*Snidely Whiplash will try to drop a giant boulder on you above the "Wannabe Mine". This is a subtle spoof on "Snow White's Scary Adventures".
*Once you reach the railroad scene, you take the first of 3 drops (this is one in the dark). Right before you fall, a train appears to be rushing towards you... this is another subtle spoof, this time on Mr. Toad.
*At the top of the big lift hill, Snidely and Dudley Do-Right are duking it out shootout style. Yet another spoof, this one on Pirates of the Caribbean.
*After the big drop, you enter a scene with Snidley in jail, attempting to lure a squirrel with the keys. An obvious spoof on Pirates of the Caribbean.
The Flying Unicorn - At the loading station, check out Merlin's collection of butterflies on the wall.
Mythos - Take a stroll on the terrace outside of Mythos. Ever wonder what's supporting the mammoth structure? A sculpted warrior, perhaps Hercules, is holding the entire thing up with his bare hands.
Dueling Dragons -
* In the queue, take a look at the charred and/or frozen remains of brave knights who tried to defeat the dragons Pyrock and Blizzrock in the past. They have some funny, gruesome poems written next to their corpses.
*Look for more funny messages in the tunnels made almost completely out of skeletons!
Some of these I found are from posts made almost 2 years ago, so I don't know if they still exist or not. A few it was hard to tell if they were talking about US Florida or US Hollywood. Can anybody help confirm if any and/or all of these are in UO now?