The new action thriller 'Source Code' explores the concept of time travel and fixing the past, so ET got the stars of the movie to dish on what they would change about their own past at the movie premiere on Monday."I’d like to go back and have eight minutes at my wedding," said Michelle Monaghan, who married Pete White in 2005. "I think I made the mistake of not video taping it.""I would definitely change my prom dress," Vera Farmiga joked. (ETonline.com)