These Peanuts specials almost always seem to have some weird little song and side story about Snoopy. In the Great Pumpkin, we get that strange little short about Snoopy sneaking behind enemy lines and singing along with the piano and stuff. In the Christmas one, there’s the side story of Snoopy entering the “lights and display contest”. This one has Joe Cool. Joe Cool has snuck into school and, as the song says, is “playin’ it cool”.