THE Ed Burns time-travel flick "A Sound of Thunder" takes us back 65 million years, to approximately the last moment when anyone still thought Ed Burns was talented. It's 2055. Burns plays Dr. Travis Ryer, a scientific genius in Chicago who works for a time-traveling safari company that takes rich, dumb clients on tours to dinosaur days. After zapping themselves into the Cretaceous period, Ryer and Co. lay down a fussy invisible plank, sort of like grandma's plastic furniture covers, to make sure nobody steps on anything in the ecosystem. Harming a single butterfly or moving a grain of pollen,...