An Easter Egg is a joke or hidden message from the developer(s) of a game to the player of said game. There are many Easter Eggs in the Sly Cooper series. This is a list of the known Easter Eggs.

Sly Cooper and the Thievius RaccoonusEdit

• Hot Dog Guy: In the job "At the Dog Track," there is a hot dog stand in the center of the race track. If looked at carefully, it is seen that the hot dog on the sign has the face of one of the employees of Sucker Punch Productions.

Sly 2: Band of ThievesEdit

• Cairo Paintings: In the introduction level there are paintings on the walls. These paintings contain portraits of bosses from the first game, as well as early concept art for Sly Cooper.
• Dimitri's Remix: In the nightclub where Bentley does the job Disco Demolitions, hit a turntable. The background music will restart, with Dimitri talking over it.
• Grave Stone: In the cemetery in "A Tangled Web", some of the grave stones say "R.I.P. Rocket," referring to the main character from Sucker Punch's first game, Rocket: Robot on Wheels.
• Crypt of the Evil Wolf Priestess: In the same episode, head down into the Crypt of the Evil Wolf Priestess as Sly after completing the corresponding mission. Stand on one of the two forward pillars in the back room of the crypt and face the wall. Open the Binocucom, then rotate the view around to face the coffin in the center of the room. Wait a few seconds, and depending on which pillar Sly is standing on, either Rocket or Jojo will appear, floating and rotating above the coffin. These characters are from Sucker Punch's first game, Rocket: Robot on Wheels.
• Attack Robot sees you: In episode 4, go towards the giant attack robot you disabled after completing the chapter. stand around the corner on the ledge in front of it. walk around the corner and keep your camera focused on the robot. if you are looking away from the robot its red  eyes will appear.

Sly 3: Honor Among ThievesEdit

• Alternate Biplane: In "Flight Of Fancy," while flying the bi-plane, pause the game and enter the code: R1, R1, RIGHT, DOWN, DOWN, RIGHT. If entered correctly, when the game resumes, the plane is now the Toonami bi-plane.
• Star Wars- During the cutscene that introduces Ayer's Rock, Murray explains that he has been being trained by the Guru. One of the background pictures shows the Guru holding onto Murray's back, which is a reference to the Star Wars scene where Yoda trains Luke. Murray is even wearing similar clothing to that of Luke.
• Sly's ancestors/Sucker Punch Cast- In Blood Bath Bay there is a Wedding poster on the "Pirate Grill" Restaurant reading: "Dev & Karin's Wedding August the 5th". Dev Cooperinda and Karin Coopergiwa are actually 2 ancestors of Sly, and are both females. Also in real life Dev and Karin were from the cast of Sucker Punch Productions.
• Wanted Poster- In venice you will notice a couple of wanted posters which say ladro on the top. Ladro is the italian word for theif, which explains sly.

The Sly CollectionEdit

• Credit Hacking: Select Sly Cooper and the Thievius Raccoonus. Once the game has been beaten, go to the movies area and highlight the credits. Hold L1 while selecting the Credits. The credits for the Sly Collection start playing, and after a moment, Bentley's hacking avatar appears. You will be able to use this to shoot and destroy the credits. Getting 100% completion in this Easter Egg does nothing.

Sly Cooper: Thieves in TimeEdit

There are more Easter Eggs in Thieves in Time than in any other Sly game.

Green LanternEdit

In Copy Cats 40 Thieves the hole that Murray and Sly go through looks like the green lantern symbol.

Robin HoodEdit

Sly's Archery Costume is much like Robin Hood famous outfit, which also has a bow, and he also steals from other people.

Spider-ManEdit

Bentley's new wheelchair has robotic arms are remeniscent of the villain Dr. Octopus from Spider-Man fame.

Back to the FutureEdit

• In the Paris Prologue, when the gang makes the jump to Feudal Japan, the gang's number plate remains, spinning, just like in Back to the Future.
• In the plans to the time machine, a "Flux Capacitor" can be seen. There is also a treasure called the "Temporal Flux Capacitor."

Teenage Mutant Ninja TurtlesEdit

• Bentley's Alter Ego minigame features him as a TMNT.
• In the Paris Prologue, when Bentley enters the sewers, he says "Interesting... the last time I was in these sewers, I was just a teenager!"
• There is a job in Medieval England named "Shell-Shocked Heart," which is similar to the Teenage Mutant Ninja Turtles Sega Genesis game TMNT: The Hyperstone Heist. Whenever the turtles are knocked out by an enemy, they say "shell shock!".

Star WarsEdit

• During Breakout! when Sly must impersonate a guard in Turning Japanese, the guard comments that he "is a little short to be a commander, a reference to Princess Leia asking Luke "Aren't you a little short to be a storm trooper?"
• During the training mission in Episode 3: Clan of the Cave Raccoon, Murray comments to Bob "Nice Shot, but don't get cocky." This same line is said by Han Solo to Luke when Luke destroys his first TIE Fighter.
• Penelope's betrayal is similar to Anakin turning to the Dark Side of the Force, since both think that their original forces are corrupt and evil.

Indiana JonesEdit

• In Go West, Young Raccoon, one of the missions requires Murray to hold up a door for Tennessee to go through, so he slides under it but drops his hat, and quickly grabs it before Murray drops the door. 
• In Forty Thieves, during the job where Salim must infiltrate the rug store, he will react to the cobras by saying "Snakes! Why did it have to be snakes?" This is a reference to one of Indiana Jones' most famous lines.

BatmanEdit

• The Ultimate Sly extra, available for 15 masks, is a clear reference to the D.C. Comics hero Batman. Not only does the outfit resemble the Batsuit, with its utility belt and cowl, the description also alludes to Batman. "Sly owns the darkest night in this costume. Cloaked in shadow, he's a tireless force for justice... and picking pockets!"

RockyEdit

• In Clan of the Cave Raccoon, during the mission where Murray trains "Bob," their is a montage of numerous activities with music playing the the background.  This is similar to ALL Rocky movies such as when Rocky Balboa is training and there is music in the background.

The Sound of MusicEdit

• In the Arabia hideout, while listening to Ms. Decibel's chatter, she can be heard singing parts of "Do-Re-Mi" from The Sound of Music.

DodgeBall: A True Underdog StoryEdit

• In Clan of the Cave Raccoon, during the mission where Murray trains "Bob" specifically in the "Duck and Cover" minigame, Murray says that "If you can dodge a penguin, you can dodge anything," which is a reference to Patches' motto in the movie "If you can dodge a wrench, you can dodge a ball."

Ratchet and ClankEdit

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  Finding 50 Secret Sly Masks unlocks Ratchet's wrench to replace Sly's cane. It also replaces coins with bolts, the currency of the R&C games, which are worth double coins in this game.
• A treasure in Medieval England called the "Medieval Metal Man" looks similar to Clank with knights' armor.

Jak and DaxterEdit

• There is a treasure called Lutrela Nivadensis that looks like a statue of Daxter in a caveman outfit.

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• Finding 60 Secret Sly Masks unlocks Cole's Amp to replace Sly's cane.

PortalEdit

• The cake Murray ignores in the ending cutcene looks like the cake seen in the ending of Valve's Portal. And also the cake Salim ate.

Looney TunesEdit

• In the Wild West level, when a coyote guard performs its falling animation, they hold a sign saying Yikes! A reference to Wile E. Coyote.

Clockwerk SightingsEdit

Clockwerk is the mortal enemy of the Cooper family and has stalked them for centuries, if not millenniums. He can be spotted from a distance during very specific moments in the game.k

Turning JapaneseEdit

• Photo Op: When taking the picture of the imperial prison, Clockwerk is on top of it.
• Pretty in Pinker: Clockwerk can be found if you look northwest from the geisha building after Rioichi talks to Bentley.

Go West Young RaccoonEdit

• Blind Date: Once you reach a section where the enemies are throwing dynamite at you from a place with a windmill and a watertower, you can look slightly above the windmill and see Clockwerk on top of a house.

Clan of the Cave RaccoonEdit

• Stone Age Reconnaissance: After talking with Bentley, look on the top of the waterfall and you can see Clockwerk.
• Starving Starving Hippo: Before you start to go after the penguins, look up high and Clockwerk is perched on top of a large dinosaur tail bone.

Of Mice and MechsEdit

• Shopping Spree: After the conversation with Bentley in the beginning, you can find Clockwerk on top of the clock tower.
• Hard Target: Clockwerk is perched on one of the towers of the Black Knight's castle, up and to the left of the draw bridge when facing it.

Forty ThievesEdit

• Copycats: When Sly gets to the room filled with treasure, jump onto the crate and look ahead at the path you should be on. With your Binocucom, you can see Clockwerk in the distance.

OtherEdit

• There is a Trophy called "Ancient Warfare 3," a spoof of the game Call of Duty: Modern Warfare 3.
• An unlockable called Ultimate Bentley for 20 Secret Sly Masks, gives him the appearance of Judge Dredd.
• During the Heavy Metal Meltdown mission in Forty Thieves there are some green books that Bentley needs to jump to. Those books have Bentley's face on them.
• In the Forty Thieves episode safehouse there's a green elephant statue behind Sly. If you move around and then go back you'll notice that it will change the way it poses.

Previous Sly GamesEdit

• A treasure called "The Dragon Claw Statue" says that some believe it is the claw of a gigantic owl, referencing Clockwerk.
  • If you look at the bottom of the statue, the words "Clockwerk was Here" can be seen sketched into it.
• There are five rewards which reference past games that are unlocked when you find the 30 clue bottles and open the vault in each area: Coopergiwa's magnet (Feudal Japan), Muggshot's coin (Wild West), Clockwerk's eye (Ice Age), Sir Raleigh's hat (Medieval England), and the Guru's moon stone (Ancient Arabia).