These are not Easter Eggs, and definitely not awesome.
Some guy played Harley Quinn's Revenge early and showed people 1. A crib (which is sitting in the middle of a room in plain view) 2. A wall Harley dedicated to Joker (you'd have to play with your eyes closed to miss), and 3. A newspaper that says "Joker is dead" (not exactly news)
How do you know he didn't have to blow up a unmarked wall to see the the crib or move alot of boxes to see the newspaper and maybe what harley wrote was in a secret room you have no idea where these are because YOU HAVE NOT PLAYED IT! so don't act like you know what you are talking about.
After you beat the game you hear lots of speculation from the other inmates talking about Joker is dead and stuff also they mention Harley in some of those conversations.
These were just spoilers (which the article did say they were) and not Easter eggs. It's just stuff that you walk by while playing the game. Still cool stuff to know if you don't care about spoilers like me
Some guy played Harley Quinn's Revenge early and showed people 1. A crib (which is sitting in the middle of a room in plain view) 2. A wall Harley dedicated to Joker (you'd have to play with your eyes closed to miss), and 3. A newspaper that says "Joker is dead" (not exactly news)
Not every easter egg must be some complex shennagins like in Zombies or other games.... sometimes they can be simple and just right in front of you