Makeup artist Kazuhiro Tsuji use contact lenses and subtle prosthetics to turn Gordon-Levitt into a younger version of Bruce Willis, a process that took about three hours a day. "I thought he just looked strange and different from how I imagined him looking. I was more just weirded out than anything else," Looper
co-star Emily Blunt told EW
. "I convinced myself, oh my God, I’m not talking to Joe, what am I doing, I’m obviously talking to his stunt man."