The recent wave of amazingly good Marvel Comics movies have been following in the footsteps of other geeky franchises by including plenty of easter eggs in their movies for fans to discover- usually when they bring home the DVD and are able to pause and rewind the movie for a better look:
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MTV has put together a collection of Every Marvel Easter Egg Explained in One Video, which is an erroneous title because the video is missing the easter eggs found in Captain America: Winter Soldier (which is due to be released on DVD in September) and Guardians of the Galaxy (which is currently in theaters).
Oh well, those would have been far too spoilery to share anyway, and in case you're worried about spoilers there may be a few in this video, so go watch the movie first then come back and see all the easter eggs you may have missed!