User blog comment:PhineasxIsabella/Phineas and Ferb Trivia/@comment-2217944-20100801024034

ANSWERS:

1. Sal Tuscany (Santa Claus)

2. Because he dislikes the carolers, especially the ones who sang "We Wish You A Merry Christmas" to him.

3. False. She was in "Jerk de Soliel", "Fast and the Phineas", "Tip of the Day", and others.