It’s the Great Pumpkin, Sam Winchester Allusions

Referencing It's The Great Pumpkin, Charlie Brown which originally aired in 1966, and is the Charlie Brown Halloween special. While the rest of the Peanuts gang celebrate Halloween, Linus waits in the pumpkin patch for the Great Pumpkin to appear.

Referencing Geddy Lee, lead vocalist for Rush. Lee joined Rush in September 1968, replacing Jeff Jones. The singer was born Gary Lee Weinrib in July 1953.

Dean uses the alias of Bob Seger, rocker primarily with the Silver Bullet Band and made it big with Night Moves, and later Old Time Rock & Roll.