Simon Pegg and Nick Frost reprise their roles of Shaun and Ed from the horror comedy film Shaun of the Dead
Last acting credit of George A. Romero
When Phineas, Ferb & Isabella finally meet up with Candice & Vanessa, they do a name routine that pays homage to "Rocky Horror Picture Show," which was written by Richard O'Brien, the voice of Laurence Fletcher.
Isabela says "Hit me with your best shot" which is reference to the song "Hit Me With Your Best Shot" by Pat Benatar.
When they escape from the Fireside Girls HQ, Phineas' rubber suit briefly and inexplicably changes colour from Black to Red