How did we not see this before – could we be any more unobservant?

A savvy Redditor noticed an extremely Irish reference in the episode where Joey discovers that Rachel has a naughty book. When he dresses up to try to recreate one of the book’s characters, Rach responds by jokingly trying to seduce him. Joey, frightened, backs up against his apartment door and on its famous Etch-a-Sketch pad is a picture of none other than the Claddagh ring.

We wonder which of the cast or crew snuck that one in.