The Raconteurs came to play on Lollapalooza’s Friday evening with the ’70s on their mind. Even the video-screen footage was colored black and white, a retro effect that carried through a show that was part jamboree, part arena blowout. Someone had to play the role of the big rock star, and Jack White obliged, hoisting guitars in the air and finger-tapping Van Halen-style solos. At the microphone, White yelped words with all the pesky fervor of a Chihuahua yipping at a bystander’s heels and tore at his guitar strings until they snapped. Such organized chaos extended to rearrangements of “Steady As She Goes” and “The Switch and the Spur,” which broke away from their conservative studio molds.