It depends if you count historically accurate terms as Easter eggs
As 'Patriots' And 'Sons of Liberty' Is said various times.
that doesn't count. But I think I saw vulcan raven in the woods
that would be hilarious if you were running through the woods and stumpled upon The End sleeping in a pile of leaves
lolz, OR they could do what they did with MGS3 and have two scenarios one where he's alive and one where he's a pile of bones.
It would also be funny to run into the fear, who is a trapper of sorts and has his own unique method of hunting. You could run into him by knocking him out of a tree or something. --- official grand master assassin of everywhere of ACIII boards