Whilst confronting his Professor, Brian says, "I'm tired of being Piggy, I want to be Ralph." This is a reference to the book Lord of the Flies.
Sam and Dean use the names 'Hudson and Rose' after Guns n' Roses performers Saul Hudson and Axl Rose.
When Michael shouts, "I am a golden god!", this is in reference to Robert Plant, the lead singer of Led Zeppelin, who shouted the same thing while overlooking the Sunset Strip from his hotel balcony.
When the boys see Sam and Dean, he calls them "Rizzoli & Isles," the main characters of Rizzoli & Isles (2010). The series is about a police officer: Detective Jane Rizzoli, played by Angie Harmon, and a medical examiner: Dr. Maura Isles, played by Sasha Alexander, who team up to solve unusual murders in Boston. The series was on TNT and is often shown alongside reruns of Supernatural.