|▲ Deck||Ominous Onyx|
- Carl is astronomer Carl Sagan. Mr. Sagan wrote the book Cosmos upon which the U.S. Public Broadcast Service series Cosmos was based.
- Mr. Sagan is known for saying "billions and billions" which is represented on Carl as the stream of zeros.
- The phrase “Crumbly... But Good” refers to the piece of apple pie pictured, which is a visual pun on the mathematical term π.