Buzzfeed have picked up on this Easter egg, which occurs during the first scene of the first episode. It shows Hannah Baker's locker, decorated after her death.
The song "More Than Gravity" by Colin & Caroline is playing, and it's also when we hear Tape 1 for the first time.
After that, we're introduced to Clay Jensen, our main man.
Now that we've watched the show like, ten times, we know that Clay was in love with Hannah. He never got the chance to tell her while she was alive. But, in that first scene, we have no idea about that.
Ouch, our frail, frail hearts.
Anyway, now that we do know about it... the song's lyrics are HEARTBREAKING. Take a look.
Now remember this?
OUCH OUCH OUCH...
Poor Clay :'(.
Brb, crying on the floor forever.