When Danny's parents burst into Sam's room looking for their son, and Sam and Tucker are lying and saying Danny went out running, there is a poster for the band Nine Inch Nails in the background.
When trying to prove that Danny Phantom is a bad ghost, Jack and Maddie mention the time he attacked the mayor back in "Public Enemies," as well as the time when he destroyed everyone's Christmas gifts in "The Fright Before Christmas." Both times, Danny was actually framed by other, malevolent ghosts.
Even Though This Episode Premiered In 2007 It Was Made In 2006 According To The Credits