Rumor has it that the upcoming Wii title The Legend of Zelda: Skyward Sword takes place before Ocarina of Time in the long-debated, maybe non-existent Zelda time line. I'm sure that particular fans will take this little Easter Egg as evidence of that. Skyward Sword Link painted a self portrait of himself and stuck it on a wall in the past, and years later, Ocarina Link checks it out and thinks it's awesome. Continuity is so great, isn't it?
That's probably what some of you are thinking, while still others are probably incredibly angry that I just revealed that little half-fiction spoiler. If you want to see what I'm talking about, look below for a screengrab of the Easter Egg in action, and/or hit the source link for the full video.