Rudd told "CBS This Morning" that playing two roles on the Netflix show "was a challenge."
"For me, the way it worked best was to record the audio for both characters," he said. "Whatever character is driving the scene is the one they would film first. I wouldn't act with a double or an acting partner, I would put a little earwig in my ear, I would listen to the opposite line."
He continued: "If I'm playing the new version of the character, I can hear the old version replying because there's somebody off-screen hitting the cue."