The film airs continuosly till 8 pm Christmas Day on TBS (I got a book about Jean Shepherd, Excelsior! You Fathead!, and it mentions that the DVD version has behind the scenes stuff. Will have to buy/rent that...
Buy it! The special features are terrific, especially interviews with cast members and the QUIZ!
FYI, another great film made from a Shepherd story featuring the family is Ollie Hopnoodle's Haven of Bliss!