User blog comment:CandaceFan/Phineas and Ferb Trivia/@comment-5137023-20101127001355

Danny Jacob

Unwind, spine

Ashley Tisdale

Isabella in Christmas Vacation Extended Version. I dunno who sings the REAL song, though.

Candace

Ferb (They're stebsiblings)

True. The Candace lookalike in "The Double" is just that: A lookalike with no relation to her.

True. I dunno the name, but it's when he gets split into his two halves: Good and Evil.

Myself