OK, while listening to the retro AT40 I've noticed that some of the Top 40 Extras include a guy named Mike Kasem (any relation to Casey himself?) interrupting and playing a song that would enter the Top 40 the following week. Examples include "Rock and Roll (Hoochie Koo)" by Rick Derringer from the 2/23/74 broadcast and "Country Road" by James Taylor from the 3/6/71 broadcast. Were the original broadcasts doctored to include these? I can't see how they could predict the future so accurately!