As part of Disneyland's 50th anniversary celebration, "50 years" icons were placed throughout the park for inquisitive guests to find. These icons were gold "Mickey Mouse" shapes with a "50" in the center of the large circle. Here's a complete list of their locations.
At the center of the Disneyland Railroad roundhouse
Main Street Cinema, in the 475th frame of "Steamboat Willie"
On the side of the triceratops in the Primeval World Diorama
On the right front horseshoe of the horse-drawn streetcar horse
Beneath seat #17 on the Omnibus
In Steve Martin's pocket in the 50 Magical Years exhibit
In the Emporium upstairs diorama depicting the seamstress, on the head of one of the pins
In a bag of taffy in the Candy Palace
At the back of a shelf of delicate miniature teapots in the China Closet
Behind the counter in Disneyana ($50/look)
Atop the Chip "n Dale Treehouse (visible only from above)
In the pot in the cupboard in the galley of Donald's Boat
Etched into the main gear on the lift of Gadget's Go Coaster
In the Goofy's Bounce House first-aid kit
In the mouth of the gopher beneath the carrots in Mickey's House
In the Minnie's House wall safe
Visible during the electrocution effect in Roger Rabbit's Car Toon Spin
At the bottom of the mailbox in Toontown
As a name tag on one of the "birdmobile" perches in the Enchanted Tiki Room
In the eye of Mara
On the back side of Schweitzer Falls
At the bottom of the barrel of rubber tarantulas in the Adventureland Bazaar
Replacing the bride's beating heart in the Haunted Mansion
In the Pirates of the Caribbean, replacing the food held by the pirate being chased by the big woman with the rolling pin
On a $2,000 Gicleé print in the Disney Gallery
At the bottom of the Splash Mountain big drop, just inside the briar patch, overhead and to your right (caution: looking for this one may cause excruciating irreparable neck injury)
In the Rivers of America on a rock in the rapids, best seen from Davy Crockett's Explorer Canoes
Around Biff's neck in The Many Adventures of Winnie the Pooh
In the mouth of the goat on Big Thunder Mountain Railroad (guests familiar with "the goat trick" will be able to see this easily)
At the bottom of the bottomless crevasse in Indian Joe's cave
In the skeleton hand that bursts from the ground after shooting the tombstone in the Frontierland Shootin' Exposition
On the starboard hub of the Mark Twain paddle wheel axel
Below decks in the Sailing Ship Columbia, replacing the knothole in the barrel of fish heads
On Billy Hill and the Hillbillies' mandolin
On the "panic stop" button of the Astro Orbitor
On the cylinder heads of the golden Autopia car
In the tree in which Stitch climbs in Innoventions' "Talk to Stitch" exhibit, but you have to ask him to bring it out and show it to you
To the right at the top of the stairs in the Starcade
Replacing one of the knobs on Captain Nemo's organ from 20,000 Leagues Under the Sea
In Star Tours, visible near the beginning of the ride as the vehicle passes through a large bay and is about to enter open space (look near the focus of the Mighty Microscope)
As a 500,000-target in the middle of Zurg's chest on Buzz Lightyear's Astro Blasters
Replacing the flying hedgehog on Alice in Wonderland
Replacing the gold witch-summoning apple outside Snow White's Scary Adventures. Update: Because naughty guests kept stealing this apple, this Mickey was removed. It has been replaced by a golden 50th anniversary Mickey Head replacing the normal head of the evil queen who appears above the Snow White attraction (see photo at right)
On Belle's petticoat
In the hand of the little Swedish boy with the blonde hair in "it's a small world"
In the Yeti's jaws on the Matterhorn Bobsleds
On the changing table in the men's restroom outside the Village Haus
On the skewer of a devil at the end of Mr. Toad's Wild Ride
Just visible through the window of Practical Pig's house on the Storybook Land Canal Boats
In the window of Walt's apartment, glowing from within