
VGB: As you’d expect with a game that is as large as Arkham City and took so long to make, developer Rocksteady has packed the world of Gotham with secrets and Easter Eggs.
Have you found any Easter Eggs in Batman: Arkham City?

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GB: "With this feature, we take a look back at the incredible Batman: Arkham City with the aim of analyzing it from the perspective of a 2024 release."
Oh man, I laughed for a few good minutes when the Joker told that Lost joke. :D
Scarecrow!
The one I got early on was when you rescue the cops in a certain building, batman asks for the code word that gordon gave them. It was "sarah" which is a reference to batman year one.
I think after Joker mentions lost there's a chance you'll hear thugs saying "I forget, do they ever explain what the island WAS?"
I found some frequency on the radio. Tune it to the right place and you'll hear someone reading off numbers. I've found this twice and both of them were when I was supposed to be looking for Riddler frequencies. The first one was easy to decode (A = 1, B = 2, etc.) and says "I will return batman" I haven't figured out the second one though:
3 20 26 18 26 16 24 1 11 4 24 9 3 8 5 2 12 18 6 16 7 11 3 10 17 5 13 4 21 8
Any ideas?
When you get to penguins museum one of the displays is Kitana from the Mortal Kombat series. When you press the audio button the penguin says something about not knowing where she came from but she killed 8 of his men before they got her.
This is a reference to the MK vs DC game