Dr. Doofenshmirtz sings about his resentment of his brother in the song My Goody Two Shoes Brother, referencing his brother's penchant for being overly well-behaved.
In this clip, Candace has to answer a call and tells her mother she is "taking" it. This is an idiom; one does not "take" a call so much as they answer it.
In this clip, Dr. Doofenshmirtz tells Perry the Platypus to "have a taste" of his ray gun. He isn't proposing that Perry literally taste the gun; he is telling Perry to experience it.