At one point, when Sam, Tucker, and Danny are at the entrance to the movie theater, there's a "Crash Nebula" arcade game in the background. Crash Nebula is one of Timmy Turner's favorite superheroes featured in The Fairly OddParents (2001) another show created by Butch Hartman.
Did you see the way all those ghost hunters were laughing at him? How embarrassing! We're gonna have to live with my dad's goof-ups for the rest of our lives!
Danny Fenton: He's standing right behind me, isn't he?