I cant really say this is an easter egg because it's part of the story line, but this was only viewable to people with HD.
You can clearly see a plane (the drug plane? It doesn't really look at like it, but its a plane.) on the left side crashing. Right when it "crashes", the dove appears and flies toward Charlie. I don't know what this means at all...maybe that their visions are "canned" or something? Who knows.
But I figured those of you without HD might want to see the plane crashing, since we *heard* it flying in the scene.