Actually, nothing has been confirmed that it's a part of anything yet. The Dinner Puzzle is only a logic puzzle and there have only been two clues released. The grundo plushie is not in either of them.
To answer your question, GemDragon, yes it has been noticed already. It's kind of old now, so anything mentioning it might have slipped away into old post land.
lol If you ever want to know if something has been posted on, you can check the Search feature on the top of the forum.