When Perry walks into Doofensmirtz's lab, he acts like Groucho Marx.
Among Candace's costumes for her audition are several of the Village People characters.
In the mummy episode, Lindana's one hit wonder can be heard in the elevator scene with Candace and the bubblegum globe.
Although This Episode Premiered In 2008 It Was Made In 2007 According To The Credits