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Easter Eggs brought to you by 
Game Developer Pictures
In the bowling training level look on the back wall. There should be pictures of the game developers.
UFO Appearance
On the level ''The Razor's Edge'', defeat all the Razor bats. After you do this, go to one of the helicopter landing pads on one of the buildings. After a short while, a UFO will appear, use it's tractor beam (which does nothing), and then disappear. Perhaps this will be referenced in a future game with the appearance of the symbiotes? I doubt it, but it's still a nifty trick to show to your friends, or an excuse to pull out an already beaten, neglected game.