This blueprint is also found in the Warden's secret room and Intensive Treatment. The blueprints are also shown in the Cyrus Pinkney Institute for Natural History as well as the Gotham City Police Department. #9: Blueprints: In Batman: Arkham City, during the first Catwoman mission there is a side table with a map and blueprints on it.#8: The Robins: Jason Todd and Tim Drake, second and third to take the mantle of Robin, are referred to by Joker in one of his Visitor Center messages where he says: 'What's it like in your organization? Do you punish your hired help when they fail? Or is that saucy outfit you make him wear punishment enough?' Also, there are scribbles on a few walls throughout the asylum depicting what appears to be a reference to the original Red Hood and abandoned wheelchairs.

This is a reference to Cillian Murphy, who portrayed Scarecrow in Christopher Nolan's Dark Knight trilogy and Jeffrey Combs, who voiced Scarecrow in The New Batman Adventures. Murphy and Combs: The first Scarecrow Interview Tape features the names 'Dr. Clooney report to Gynecology.' It is a reference to George Clooney, who played Batman in Michael Keaton's Batman and Robin. Kellerman from Joker's laughing gas, stand in the main room looking at the smaller room where they were trapped. Clooney: After you rescue Aaron Cash and Dr. A thug holding Carl Todd hostage will say 'You see Hego over there? He's got a thing for blades.' David Hego is Rocksteady's art director.

#5: Rocksteady: In most locations the player can notice the pictures of the supposed patients are actually photos Rocksteady Studios' crew.

#4: Visitor Center: When Batman enters the Visitor Center, if the player turns around for some time the mannequin's arms have changed, and near the end of the game it's revealed that the mannequin is actually Joker himself.

#3: Ra's al Ghul: After discovering Ra's al Ghul's body bag in the Arkham Mansion, if the player goes back to the Morgue it has mysteriously disappeared.

#2: 'You don't need to be mad to work at this Asylum!': In the Secure Transit of Intensive Treatment you can find a glass saying 'You don't need to be mad to work here.

Also, near that section you can see a where the Asylum staff leaves meat for Croc.

#1: Killer Croc: In Intensive Treatment, you can see an area with security collars like the one worn by Killer croc and photos of him there's also a locker with a photo of Croc's hand with a message saying 'Hands off my locker'.

WARNING: THE FOLLOWING ARTICLE CONTAINS SPOILERS! READ AT YOUR OWN RISK!

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