User blog comment:Leanilla/Phineas and Ferb Across The Second Dimension Planet Premiere!/@comment-406459-20110721194444/@comment-5151799-20110721204705

Epic! Can't wait to see the full music video!

Notice that Perry's playing the guitar... with his fedora hat on! And Phineas, Ferb, Buford, Slash, and the audience can clearly see him. Surely, this is not canon...