Make Play

Candace switches places with a princess who looks just like her, but the ongoing antics of Phineas and Ferb prevent her from enjoying the royal luxuries, even for a day. Meanwhile, Phineas and Ferb enlist the princess to help them build a giant jukebox filled with live bands, and Dr. Doofenshmirtz plans on using his Claw-inator to ruin his brother’s dedication of the Danville Opera House.

Songs

 * Do Nothing Day

The "Too Young" Line
None.

Perry's entrance to his lair
Perry uses a jack to go down to his lair.

Evil Jingle
Doofenshmirtz Evil Blimp Again!

Background Information

 * This might take place near the end of summer since there are Back to School sales.
 * This episode aired in Latin America as "La Doble" ("The Double") in Latin Spanish. It aired as "Brincando de Princesa" ("Playing Princess") in Brazilian Portuguese. In Germany it aired on December the 10th as "Königlicher Besuch" ("Royal Visit").
 * Carl and Major Monogram both break the fourth wall when Carl replied to Major Monogram that it's a cartoon (since Phineas and Ferb IS a cartoon), and Major Monogram scolds Carl about breaking the fourth wall. Also this is the first time a forth wall was broken because of mentioning the fourth wall.

Continuity

 * This marks the second appearance of Jeremy and the Incidentals. ("The Best Lazy Day Ever")
 * This episode is the fourth time that "two Candaces" are seen ("Split Personality", "Phineas and Ferb's Quantum Boogaloo," and "Rollercoaster: The Musical!.")
 * When Candace is bored in the throne room, the ticking sound from Don't Even Blink is heard. This sound was also heard in "Unfair Science Fair Redux (Another Story)" and "That Sinking Feeling".
 * Third time the word "Doppleganger" is said. ("I, Brobot", "Cheer Up Candace")
 * Doofenshmirtz's blimp appears again ("The Fast and the Phineas"), ("Run Away Runway") and ("Atlantis")
 * Candace having a royal lookalike is similar to Jeremy's royal lookalike, Charles Pipping IV.

Allusions

 * The concept of a commoner and royalty switching places comes from Mark Twain's story The Prince and the Pauper.

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace
 * Thomas Sangster as Ferb
 * Caroline Rhea as Mom
 * Mitchel Musso as Jeremy
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Richard O'Brien as Dad
 * Dee Bradley Baker as Perry
 * Alyson Stoner as Isabella
 * Kelly Hu as Stacy
 * Olivia Olson as Vanessa
 *  designates a character that did not appear in this episode