Lots of fun easter eggs in this one.
If you've been around long enough, you'll remember when an "Easter Egg" required some effort to find. You'd have to basically know what to do from word of mouth to "hatch" it. Eg. You'd have to enter a certain formula in a certain cell in Excel, and if you followed the procedure up would come something like the names of the coders.
They were big in gaming too, you would have to follow some seemingly useless path in a game to stumble on another game or a reward of some kind. In a remake of Pitfall, for example, if you went to the right place, you'd end up inside the original Atari version of the game from 20 years earlier.
As with everything now, these things are just thrown right in your face.
I hate the use of this term - there's no "unwrapping" any more. Why not say "cross-references" or, God forbid, a word like "allusions".
[End of psycho rant/lecture/social commentary]