"It's that guy again! Wasn't he on...uhm...what was that show again?" Normally, when you watch a movie or show and this situation comes up, you pause the video (if you're on demand or on video streaming), get your phone or tablet, then try to search for specific terms that would eventually lead you to who that actor is. But it will take you a few minutes, maybe hours. Now if you have an Amazon device and Amazon Instant Video, it will just take you a few seconds.