The title of this episode's second segment, "Comet Kermilian", refers to the Culture Club song "Karma Chameleon" from the '80s.
Doofenshmirtz mentions his life as the family lawn gnome, which was previously mentioned in "Lawn Gnome Beach Party of Terror".
Candace says near the end "When I'm 88, you'll be so busted!" followed by Ferb correcting she will be 88-and-a-half, and Kermilian's Comet can be seen every 73-and-a-half years, revealing Candace is 15 years old at the time of the episode.
Kermilian's Comet may be a parody of Halley's Comet, which can be seen every 76 years.
Although This Episode Premiered In 2009 It Was Made In 2008 According To The Credits