In pretty much every episode, just at the end of the pre-credits sequence, Grissom usually tells a bad joke about the crime he's about to investigate. This time, however, he remains silent.
Jay Karnes who plays IA Officer Wagenbach is best known for his role in FX's hit show The Shield. The character he played on the Shield was detective Dutch Wagenbach. This is a definite Easter egg, and nod to the show's arguably most interesting character.